Answer:
valley
Explanation:
a valley is the space between two mountains and may comprise a river as well
17. Which of the following is the closest weight in newtons of a 7.0-kilogram
bowling ball? *
A. 7.0 newtons
B. 70 newtons
C. 700 newtons
d. 7000 newtons
Weight = (mass) x (gravity)
Weight = (7.0 kg) x (gravity)
On Earth, where (gravity) is roughly 10 N/kg . . .
Weight = (7.0 kg) x (roughly 10 N/kg)
Weight = roughly 70 Newtons
That's B on Earth.
It would be some other number on other bodies.
Final answer:
A 7.0-kilogram bowling ball on Earth would weigh approximately 70 newtons, as weight is calculated by multiplying mass by Earth's gravity (9.8 m/s²).
Explanation:
The weight of an object on Earth can be calculated using the formula Weight (N) = Mass (kg) × Gravity (m/s²). Since the standard acceleration due to gravity on Earth is approximately 9.8 m/s², a 7.0-kilogram bowling ball would have a weight of 7.0 kg × 9.8 m/s² = 68.6 N, which we round to 70 newtons (option B).
This conversion is crucial for solving problems that involve force and mass, such as questions on kinetic energy, momentum, and collision outcomes as typically covered in physics classes.
8. What is the mass number of an atom that has 12 neutrons and 11 protons?
A 11
B 24
C 23
D 12
Answer:
C. 23
Explanation:
The mass is made up by the proton and nuetrons,
12+11=23 your atomic mass
A static electric charge can be released as __________. *
A.a spark
B.heat
C.a continuous current
D.a gas
Final answer:
A static electric charge can be released as a spark, a brief and intense discharge of electrical energy that occurs when the accumulated charge overcomes resistance of the insulating medium.
Explanation:
A static electric charge can be released as a spark. Static electricity is the accumulation of electric charge on the surface of an object, and this arrangement of charge remains static until it finds a pathway to discharge. When static charge accumulates to a sufficient level, it can overcome the dielectric (insulating) medium separating it from a neighboring conductor or the ground. At that point, the charge can suddenly move towards the conductor, releasing energy in the form of a spark that can also create light and heat. This is analogous to what happens in a spark plug of a gas engine, where a high electric field is created to ignite the fuel-air mixture or like the sudden discharge of lightning from storm clouds.
The option suggesting the release of a gas is incorrect as the discharge does not involve the creation of new chemical substances like a gas, but rather the movement of existing charge. Also, while the spark can generate heat, it is not solely released as heat, and it does not constitute a continuous current because it is a quick, transient event.
2. Weight is a force from gravity pulling down on any object with mass.
True
False
Answer:
True
Explanation:
What will occur when the trough of Wave A overlaps the trough of Wave B?
A: Destructive interference will occur, causing the new wave to have more energy than Wave A or Wave B.
B: Constructive interference will occur, causing the new wave to have more energy than Wave A or Wave B.
C: Destructive interference will occur, causing the new wave to have less energy than Wave A or Wave B.
D: Constructive interference will occur, causing the new wave to have less energy than Wave A or Wave B.
Answer:
its B
Explanation:
PHYSICS
I need help with number two!!!!
Answer:
mgh₁ + ½mv₁² = mgh₂ + ½mv₂²
Explanation:
Initial total energy = final total energy
PE₁ + KE₁ = PE₂ + KE₂
mgh₁ + ½mv₁² = mgh₂ + ½mv₂²
PLEASE ANSWER!!!!
Ingrid hangs a black shirt on the clothesline to dry. After a few hours, she removes the black shirt from the clothesline and notices that it feels hot. What causes the black shirt to feel hot? How does molecular motion change when the black shirt gets hot?
EXPLAIN!!!
Answer:
consumes the hot
Explanation:
Black consume heat and white reflects the heat and doenst get that hot
A substance contains only one type of atom. The substance is a/an ____________. A. solution B. element C. mixture D. compound
Answer:
the answer is b
Explanation:
Show that a body projected vertically up from the ground, the distance travelled by it in the last second of its upwards motion is an constant independent of its initial velocity
Answer and explanation:
Let [tex]v_1[/tex] be the velocity of a body projected vertically up, 1 second before it reaches its maximum height. We know, from the kinematics equations, that the distance traveled [tex]y[/tex] in an interval of time [tex]t[/tex] is equal to:
[tex]y=v_0t-\frac{1}{2}gt^{2}[/tex]
Then, in the last second, the distance traveled [tex]y_1[/tex] is equal to:
[tex]y_1=v_1t-\frac{1}{2}gt^{2}[/tex]
But the velocity [tex]v_1[/tex] is related to the time by the equation:
[tex]t=\frac{v_1}{g}\\\\v_1=gt[/tex]
And substituting this expression in the equation above, we obtain:
[tex]y_1=gt^{2}-\frac{1}{2}gt^{2}\\\\y_1=\frac{1}{2}gt^{2}\\\\y_1=\frac{1}{2}(9.8m/s^{2})(1s)^{2}\\ \\y_1=4.9m[/tex]
It means that the distance traveled by the body in the last second of its motion is a constant, independent of its initial velocity.
(WILL MARK BRAINLIEST AND 25pts) How many light-years are in a parsec?
a. 0.5
b. 3
c. 6
d. 10
Answer:
3.26156 thats the answer i would go with b
Explanation:
Answer:
b.) 3
Explanation:
There are approximately 3.261 light years in a parsec
What is the force exerted by a catcher’s glove on a 0.15 kg baseball moving at 35 m/s that is stopped in 0.02 sec?
Answer: 262.5N
Explanation:
Given that:
Force exerted by a catcher’s glove (F) = ?
Mass of baseball (m) = 0.15 kg
Speed (s) = 35 m/s
Time (t) = 0.02 sec
The force exerted is obtained by dividing the momentum by time.
i.e Force = momentum/time
(since momentum is equal to the product of mass and speed)
i.e F= mv/t
F = (0.15 kg x 35 m/s)/0.02 sec
F = 5.25kgm/s / 0.02 sec
F = 262.5N
Thus, the force exerted by a catcher’s glove is 262.5 newton
Final answer:
The force exerted by a catcher's glove on a 0.15 kg baseball moving at 35 m/s that is stopped in 0.02 sec is 262.5 N in the direction opposite to the baseball's initial motion.
Explanation:
The force exerted by a catcher’s glove on a baseball can be found using Newton's second law of motion, which states that force is equal to the mass of an object multiplied by its acceleration (F = ma). The acceleration can be calculated by using the change in velocity (final velocity - initial velocity) divided by the time it takes to change the velocity.
Since the baseball is stopped, its final velocity is 0 m/s. Therefore, the acceleration a is (-35 m/s) / 0.02 s = -1750 m/s² (the negative sign indicates a decrease in speed). Subsequently, the force F exerted can be calculated as (0.15 kg) × (-1750 m/s²), which results in -262.5 N. The negative sign indicates that the force is applied in the direction opposite to the baseball's motion.
Thus, the force exerted by the glove on the baseball is 262.5 N in the direction opposite to the initial motion of the baseball.
1. Which of the following is carried by the waves from one place to another?
a) Velocity b) Energy c) Mass d) Wavelength
Answer:
B) Energy
Explanation:
Which statement about one of Newton’s laws of motion is incorrect ?
A)the total force on an object is calculated by multiplying it mass times its acceleration,
B)An object is motion continues in motion unless acted upon by and outside force.
C) For every action there is an equal reaction perpendicular to the direction of the force.
D)a=F/m
According to Newton's law, the incorrect statement is "for every action, there is an equal reaction perpendicular to the direction of the force". Therefore, option C is correct.
This statement does not accurately represent Newton's third law of motion. Newton's third law states that "For every action, there is an equal and opposite reaction." The reaction force is equal in magnitude but opposite in direction to the action force, not necessarily perpendicular to it.
These laws describe the relationships between the motion of objects and the forces acting upon them. They are foundational concepts in the field of classical mechanics and provide a framework for understanding how objects move and interact with one another. Therefore, option C is correct.
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How is thermal energy transferred during conduction? Check all that apply.
Thermal energy is transferred between particles that are not touching each other.
Thermal energy is transferred between particles that are in direct contact with each other.
Thermal energy is transferred between objects of different temperatures.
Thermal energy is transferred between objects of the same temperature.
Thermal energy is transferred from slow-moving particles to fast-moving particles.
Thermal energy is transferred from fast-moving particles to slow-moving particles.
Answer: B,C,F
Explanation:
the picture of proof
Answer:
b c f is right
Explanation:
This is an image of a stream table modeling how water can change surface features of Earth. Which of the following processes is this stream table NOT modeling?
A) Weathering
B) Erosion
C) Deposition
D) Land-form changes
A bicycle and a rider with a combined mass of 110 kilograms are traveling at a speed of 8 meters per second. What is the kinetic energy of the bicycle and the rider?
KE= 1/2 mv2
Answer:
Math Skills Calculating Kinetic Energy and Potential Energy ... moving object depends on its mass and speed. ... represents the object's speed, measured in meters per second (m/s). ... Example 1: A bicycle and rider with a combined mass of ... the bicycle and rider? Given: m = 110 kg v = 8 m/s. Unknown: Kinetic energy (KE).
I think
Explanation:
The kinetic energy of a bicycle and rider with a combined mass of 110 kilograms traveling at a speed of 8 meters per second is 3520 joules, calculated using the formula KE = ½ mv².
Explanation:The kinetic energy of an object can be calculated using the formula KE = 1/2 mv^2, where KE is the kinetic energy, m is the mass of the object, and v is the velocity of the object.
In this case, the combined mass of the bicycle and rider is 110 kg and the velocity is 8 m/s.
Substituting these values into the formula, we get KE = 1/2 (110 kg) (8 m/s)^2 = 3520 J.
The student's question pertains to calculating the kinetic energy of a bicycle and rider with a known mass and speed. The formula to find kinetic energy (KE) is KE = ½ mv², where 'm' is mass and 'v' is velocity.
To compute the kinetic energy for the given mass of 110 kilograms and velocity of 8 meters per second, we substitute these values into the formula:
KE = ½ (110 kg) × (8 m/s)²
KE = 55 kg × 64 m²/s²
KE = 3520 joules
Thus, the kinetic energy of the bicycle and rider is 3520 joules.
Use the image to answer the questions about The current is flowing
the right-hand rule.
The magnetic field is flowing out of the_____
______of the screen and into the
________of the screen.
Answer:
the current is flowing to the left
the magnetic field is flowing out of the bottom of the screen
the screen and into the top of the screen.
Explanation:
Compare and contrast Earth to the other inner planets.
The inner planets are;- Mercury, Venus, Earth and Mars. Earth is the only planet which has atmosphere, water on the surface or know of to have water(Mars might have water underground), and life.
Mercury is pretty much a small planet on fire by day, but freezes at night.
Venus is a gas planet which is usually on fire in places too, but has mass ice craters on the surface.
Earth, well just look out your window.
Mars may have been an earth like planet at one stage, (still unknown) but is known as the red planet due to its volcanic activity. Mars also has the biggest mountain/volcano on any known planet called Mt Olympus. It's 3 times the size of Mt Everest.
Hope this helps!! :)
How do electromagnetism and gravitation differ from the strong and weak nuclear forces?
An object with a positive electric charge will be attracted to what? *
A.Any object no matter what its electric charge.
B.An object with no electric charge.
C.An object with a negative electric charge.
D.Another object with a positive electric charge.
Answer:
C. An object with a negative electric charge.
Final answer:
An object with a positive electric charge will be attracted to an object with a negative electric charge. This is due to the principle that unlike charges attract each other, which is governed by Coulomb's law. So the correct option is C.
Explanation:
An object with a positive electric charge will be attracted to an object with a negative electric charge. According to the principles of electrostatics, like charges repel, and unlike charges attract each other. When you have two objects, one positively charged and the other negatively charged, the electrostatic force between them will cause them to move towards one another. This attraction is explained by Coulomb's law, which states that the force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
An object with no electric charge, or a neutral object, can also be attracted to a charged object because of polarization that occurs when the charged object is brought near. The electric field of the charged object causes the charges in the neutral object to rearrange, creating a region with a slight excess of charge that is opposite to that of the charged object, leading to an attractive force. However, two positively charged objects would repel each other, as would two negatively charged objects.
Weight is a force that depends on mass and: *
A. friction
B. gravity
C. magnetism
D. energy conservation
Describe how elements are formed in stars.
Answer:
Stars create new elements in their cores by squeezing elements together in a process called nuclear fusion.
Explanation:
Final answer:
Elements in stars are formed through nuclear fusion, where hydrogen fuses into helium. Stars with masses above 8 solar masses can create elements up to iron through nucleosynthesis.
Explanation:
Elements are formed in stars through the process of nuclear fusion. This occurs when a star's core temperature exceeds 10 to 12 million K, allowing hydrogen nuclei to fuse into helium - a stage known as hydrogen burning. As stars evolve, those with masses greater than about 8 solar masses undergo nuclear reactions involving carbon, oxygen, and other elements, synthesizing new elements up to iron, a process known as nucleosynthesis. In late stages of a star's life, massive stars either explode as supernovae or shed their outer layers, ejecting these heavy elements into interstellar space.
The ejected matter then becomes part of the raw material for new star formation, leading to successive generations of stars with higher proportions of these heavy elements. The elements that are essential to life on Earth, such as carbon, oxygen, nitrogen, and iron, were produced in the cores of stars or the dramatic finale of supernovae. Meanwhile, lighter elements like lithium, beryllium, and boron are less abundant when compared to heavy elements such as iron in stars, indicating that heavier elements are built up over time through stellar processes.
Frogs, hawks, and lions are all _________
A.herbivores
B.carnivores
Answer:
A. Carnivores
Explanation:
Frogs, hawks, and lions are all carnivores. Thus, the correct option for this question is B.
What are Carnivores?Carnivores may be characterized as animals or organisms that typically eat the meat or flesh of other animals or a plant that traps and digests insects or other small animals. Some examples of carnivores may include lions, eagles, leopards, polar beer, frogs, etc.
Carnivorous animals have specialized dentition to hunt and kill prey. Some carnivorous animals such as chameleons and a few species of frogs have long sticky tongues to catch prey. Most carnivores are usually fast as they need to chase and tire their prey. Carnivores are also known as predators.
Organisms like grasshoppers, goats, horses, rabbits, deer, etc. are categorized under the category of herbivores as they only eat plants and their derived products.
Therefore, frogs, hawks, and lions are all carnivores. Thus, the correct option for this question is B.
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Find the total translational kinetic energy of
2.5 L of oxygen gas held at a temperature of
6
◦C and a pressure of 2.5 atm.
Answer in units of J.
Answer:
953.7 J
Explanation:
The average translational kinetic energy of the molecules in a gas is given by
[tex]KE=\frac{3}{2}kT[/tex]
where
[tex]k=1.38\cdot 10^{-23} J/K[/tex] is the Boltzmann constant
T is the absolute temperature of the gas
Here we have:
[tex]T=6^{\circ}C+273=279 K[/tex] is the absolute temperature of the gas
Therefore, the average translational kinetic energy of each molecule is:
[tex]KE=\frac{3}{2}(1.38\cdot 10^{-23})(279)=5.78\cdot 10^{-21} J[/tex]
Now in order to find the total translational kinetic energy of all molecules, we have to find the number of molecules in the gas.
We can do it by using the equation of state for an ideal gas:
[tex]pV=nRT[/tex]
where here:
p = 2.5 atm is the gas pressure
V = 2.5 L is the volume
[tex]R=0.082J/mol K[/tex] is the gas constant
[tex]T=279 K[/tex] is the temperature
Solving for n, we find the number of moles:
[tex]n=\frac{PV}{RT}=\frac{(2.5)(2.5)}{(0.082)(279)}=0.273 mol[/tex]
So the number of molecules contained in this gas is:
[tex]N=nN_A=(0.273)(6.022\cdot 10^{23})=1.65\cdot 10^{23}[/tex]
where [tex]N_A[/tex] is Avogadro number. Therefore, the total translational kinetic energy in the gas is:
[tex]KE_{tot}=N\cdot KE = (1.65\cdot 10^{23})(5.78\cdot 10^{-21})=953.7 J[/tex]
Final answer:
The total translational kinetic energy of 2.5 L of oxygen gas at 6 degrees Celsius and 2.5 atm pressure can be found by first calculating the number of moles using the ideal gas law, then using Boltzmann's constant to find the average kinetic energy per molecule, and finally multiplying by Avogadro's number and the number of moles.
Explanation:
To calculate the total translational kinetic energy of 2.5 L of oxygen gas at 6
degrees Celsius (which is 279 K) and a pressure of 2.5 atm, we can use the ideal gas law and the equation for the average kinetic energy per molecule. First, we need to find the number of moles of oxygen using the ideal gas law PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant (8.314 J/(mol*K)), and T is the temperature in Kelvin.
Converting the volume from liters to cubic meters (1L = 0.001 m³) and pressure from atm to Pa (1 atm = 1.01325 × 10⁵ Pa), we get:
V = 2.5 L = 0.0025 m³
P = 2.5 atm = 2.5 × 1.01325 × 10⁵ Pa
The number of moles (n) can be calculated as follows:
n = PV / RT
Now, using Boltzmann's constant (k) of 1.38 × 10⁻²³ J/K, we can find the average translational kinetic energy per molecule at this temperature using the formula provided:
kBT = (1.38 × 10⁻²³ J/K)(279 K)
To find the total translational kinetic energy, we must multiply the average kinetic energy per molecule by Avogadro's number (6.022 × 10²³ mol-1) and then by the number of moles we found earlier.
3. consider the forces acting on a car. when the car is accelerating, it will move in the direction of the net force. this is because the force of the engine is large enough to overcome the forces of friction and air resistance. however, objects do not always move in the direction of the net force. explain how this would be the case for a car coming to a stop at a traffic light. your answer should include a diagram showing the forces acting on the vehicle.
The force that accelerates the car is the static friction force.
What is acceleration?Acceleration is a rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down.
According to the condition,
When the car is accelerating, it will move in the direction of the net force. this is because the force of the engine is large enough to overcome the forces of friction and air resistance.
However, objects do not always move in the direction of the net force.
To accelerate something, there needs to be a force from the outside. For the car accelerating from rest, the only thing acting on it in the forward direction is the friction due to the ground.
The force that accelerates the car is the static friction force. It is the only external force acting forward on the car and is therefore responsible for its acceleration per Newton's second law.
That force is the equal and opposite reaction to the force the wheel exerts backward on the ground per Newton's third law.
The below diagram shows the exact answer.
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In a system, when energy is transformed from one form to another
O
A. some energy is always destroyed.
O
B. new energy is created.
O
c. the total energy is conserved
O
d.
all energy changes to friction
HELP Please
Answer:
C: the total energy is conserved
Explanation:
In a closed system they total mechanical energy is always conserved although energy may change from one form to another
Answer:
C. the total energy is conserved
Samantha and Emily are pushing a box of textbooks in the same direction across their classroom. Samantha is applying a force of 10 newtons, and Emily is applying a force of 10 newtons. What is the net force of their efforts?
Answer: 20 newtons
Explanation:
Given that:
Force applied by Samantha = 10 newtons
Force applied by Emily = 10 newtons
Direction of both forces = same
Net force of their efforts = ?
Since net force of forces applied in the same direction is obtained by adding up the seperate forces applied, then
Net force = (10 newtons + 10 newtons)
Net force = 20 newtons
Thus, the net force of their efforts is 20 newtons.
A 2.0 kg guinea pig runs at a speed of 1.0 m/s what is the guinea pigs kinetic energy
The kinetic energy for the above data is 1.0000 J.
The kinetic energy (KE) is calculated using the formula KE = 1/2 * m * v^2, resulting in a kinetic energy of 1.0 Joule for a 2.0 kg guinea pig moving at a speed of 1.0 m/s.
The kinetic energy (KE) of an object in motion is determined by the formula: KE = 1/2 * m * v^2, where m is the mass and v is the velocity. For the guinea pig in question, with a mass (m) of 2.0 kg and a velocity (v) of 1.0 m/s, the calculation is as follows:
KE = 1/2 * 2.0 kg * (1.0 m/s)^2
KE = 1/2 * 2.0 kg * 1.0 m^2/s^2
KE = 1.0 kg * 1.0 m^2/s^2
KE = 1.0 Joule
Therefore, the kinetic energy of the 2.0 kg guinea pig running at a speed of 1.0 m/s is 1.0 Joule.
Suppose a 1500 kg speed boat is traveling with a velocity of 30 m/s what is the speed boats Monument
Answer: 45000kgm/s
Explanation:
Given that:
Mass of speed boat = 1500 kg
Velocity of speedboat = 30 m/s
Speed boats Momentum = ?
The Speed boat momentum is the product of its mass and the velocity by which it moves. Momentum is a vector quantity and measured in kgm/s
i.e Momentum = mass x velocity
= 1500 kg x 30 m/s
= 45000kgm/s
Thus, the speed boats momentum is 45000kgm/s
A wave has 16 cycles in 208 m of space. It’s frequency is 4hz. What is the velocity of the wave
Answer:
52 m/s
Explanation:
Wavelength is the distance between two successive crests. Two crests make one circle hence 16 cycles are equal to 16 wavelengths. Each wavelength is equal to 208/16=13 m long
Speed of wave is given as the product of wavelength and frequency, expressed as
S=fw
Where f is the frequency and w is the wavelength
Substituting 13 m for w and 4 Hz for f then
S=4*13=52 m/s
Therefore, the speed is equivalent to 52 m/s