Answer:
3N
Explanation:
Workdone = F x d
F = force
d = distance 8m
Workdone = 24J
24 = F x 8
Divide both sides by 8
24/8 = F x 8/8
3 = F
F = 3N
A child is playing with a spring toy, first stretching and then compressing it.
[T-2, C–5, A-1]
a) List the energy transformations taking place during this activity.
SPH4U – Unit Test (Energy & Momentum)
5 | P a g e
b) Is the force applied by child constant or variable? Give reason for your answer.
c) Draw a graph showing variation of the restoring forces developed inside the
given spring when it is stretched or compressed.
d) How this force is related to the force applied by the child?
When a child compresses a spring toy, potential energy is stored. When the spring is released, the potential energy transforms to kinetic energy. The force the child applies is variable and directly related to the restoring forces of the spring.
When a child plays with a spring toy, it experiences a Energy transformations of energy: kinetic energy to potential energy and vice versa.
When the child first compresses the spring, the child is doing work on the toy, and as a result, the spring stores potential energy.
When the spring is released, it transforms the stored potential energy to kinetic energy as it bounces back.
This is a demonstration of the law of conservation of energy as total energy is conserved in the system.
The force applied by the child is variable because it changes depending on whether the spring is being compressed or released.
The restoring forces developed inside the spring will be proportional to the displacement: F = -kx, where 'k' is the spring constant and 'x' is the displacement.
A graph of these forces would be a straight line passing through the origin, with the slope equal to 'k'.
The force applied by the child to compress or stretch the spring is directly related to the variable tension or compression forces in the spring which are responsible for its restoration back to its original shape.
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PLEASE ANSWER ASAP!!!!!!!
The picture below shows a toy car in the process of rolling down a ramp. At point X, the kinetic energy is 50 Joules (J), and the potential energy is 30 J.
What is the total energy in the system once the car reaches the bottom of the ramp?
A
20 J, because the energy in the system cannot change form but can be created and destroyed
B
80 J, because the energy in the system can change form but cannot be created or destroyed
C
30 J, because the potential energy is the only energy at the bottom of the ramp
D
50 J, because the kinetic energy is the only energy at the bottom of the ramp
Answer:
B. Mechanical energy= 50J+30J=80J
Answer:
80J
Explanation:
A leaf electroscope is a device that indicates the existence of electric charge on an object. The leaves spread apart when an object is brought near or touches the electroscope. What observation would suggest that the object touched the electroscope?
Answer: the leaves remainined apart after the charged was removed
Explanation:
What does hydroelectric power do?
A) releases carbon dioxide into the air
B) causes thermal pollution
C)requires building dams that can harm ecosystems
D)uses the energy inside an atom's nucleus to generate electricity
Answer: D
Explanation:
Answer:
D)uses the energy inside an atom's nucleus to generate electricity
Explanation:
it was on my reading passage
A wave with a speed of 54m/s travels through vulcanized rubber with a wavelength of 0.90 m. What is the frequency of this wave? *
4 points
80 Hz
50 Hz
60 Hz
0.017 Hz
Answer: 60Hz
Explanation:
Given that
Speed of wave V= 54m/s
Wavelength ( λ) = 0.90 m
Frequency of wave F = ?
Recall that the frequency of a wave is the number of cycles the wave complete in one secon, and it is measured in hertz.
So, apply the formula
V = F λ
F = V/ λ
F = 54m/s / 0.90 m
F = 60Hz
Thus, the frequency of this wave is 60 Hertz
Jaquan found 2 footballs in his closet to practice throwing long distances. Both footballs are of equal size. However, one has a mass of 1 kg and the other is 2 kg. Which football will travel the farthest distance when thrown and why? Or will they travel the same distance?
Answer:
The 1kg will travel farther.
Explanation:
Because it is lighter
Aaron and Sam cover the same distance on foot at the speed of 8 km/hr and 6
km/hr. Find the distance covered by each one of them when one takes 15 minutes
longer than the other.
Answer:
6 km
Explanation:
speed of Aaron, v = 8 km/hr
speed of Sam, v' = 6 km/hr
time 15 min = 0.15 hr longer than the other
Let the distance covered by both of them is d.
Let the time taken by Aaron is t and the time taken by Sam is t + 0.25
use the formula of distance = speed x time
For Aaron:
d = 8 x t ..... (1)
For Sam:
d = 6 ( t + 0.25) ..... (2)
From (1) and (2)
8 x t = 6 (t + 0.25)
8 t = 6t + 1.5
2t = 1.5
t = 0.75 hour
So, the distance traveled by both is 8 x 0.75 = 6 km.
If 3920 J are used to raise a 200-kg mass, how high is the mass raised?
Answer: 1.75m
Explanation:
Given that,
mass = 200 kg
height by which mass was raised = ?
Energy required = 3420J
Apply the formula for calculating energy,
Energy = mass x acceleration due to gravity (g) x height
Energy = mgh
3420J = 200kg x 9.8m/s^2 x height
3420J = 1960kgm/s^2 x height
Height = 3420J / 1960kgm/s^2
Height = 1.75m
Thus, the mass was raised 1.75 metres high
Answer:1.96m
Explanation:
work=3920J
mass=200kg
g=10m/s^2
Height=work/(mass x g)
Height=3920/(200 x 10)
Height=3920/2000
Height=1.96m
A circuit contains four light bulbs. One light bulb goes out but the other three stays it. This must be an)
circuit
A parallel
B Closed
C series
D open
Answer:
It is a parallel connection
Explanation:
In parallel connection the
Cell is not easily used up because the cells share the total current generated together with all bulbs.
But a major problem is the bulbs must not be left together undisconnected to avoid exhaustion arising from short fall in the strength of one cell as this bounds to affect others
Answer:
parallel
Explanation:
What is the equivalent resistance in this parallel circuit?
What is the voltage in the circuit?
What is the total current in the circuit?
120 V
5.003 10.093 15.003
Answer:
Equivalent resistance: 2.73 Ω
Voltage: 120 V
Total current: 44 A
Explanation:
In the figure attached, the circuit is shown
The equivalent resistance (Rt) is calculated as follows:
1/Rt = 1/R1 + 1/R2 + 1/R3
where R1, R2 and R3 are the individual resistances. Replacing with R1 = 5 Ω, R2 = 10 Ω and R3 = 15 Ω, we get:
1/Rt = 1/5 + 1/10 + 1/15
1/Rt = 5.5/15
Rt = 15/5.5 = 2.73 Ω
From the picture, the voltage in the circuit is 120V
From Ohm's law:
It = V/Rt
where It is the total current, V is the voltage and Rt is the equivalent resistance
It = 120*5.5/15 = 44 A
Answer:
Equivalent resistance: 2.7
Explanation:
trust me
During summer in the northern hemisphere _____.
the sun is closer to than during winter
the sun's rays do not hit as directly as during winter
the days are longer than during winter
Answer:
The days are longer than during winter
Explanation:
In the summer, days feel longer because the Sun rises earlier in the morning and sets later at night. When the North Pole of the Earth is tilted toward the Sun, we in the northern hemisphere receive more sunlight and it's summer. ... It is also the day that the Sun reaches its highest point in the sky.
Spaceship 1 and Spaceship 2 have equal masses of 300 kg. They collide. Spaceship 1's final speed is 2 m/s, and Spaceship 2's final speed 1 m/s in the same direction. What is their combined momentum?
A. 600 kg-m/s
B. 900 kg-m/s
C. 1,200 kg-m/s
D. 3 m/s
Mimi makes a table about the two types of beta decay. A 5 column table with 2 rows. The first column is labeled type of decay with entries beta plus and beta minus. The second column is labeled particle released with entries positron and electron. The third column is labeled change to nucleus with entries proton changes to neutron and neutron changes to proton. The fourth column is labeled change to mass number with entries no change and decrease by 1. The last column is labeled change to atomic number has entries decrease by 1 and increase by 1. What error did Mimi make? No change in mass number occurs in beta minus decay. The changes to atomic number are reversed. A proton is released in beta plus decay. The changes to the nucleus are reversed.
Answer:
No change in mass number occurs in beta minus decay
Explanation:
Answer:
Explanation:
No change in mass number occurs in beta minus decay
An object's (mass or weight) will remain constant throughout the universe, but its (mass or weight) can change from planet to planet. If you increase the mass of a planet, what happens to its gravity? (Strength of gravity increases, strength of gravity decreases, strength og gravity stops completely) If the gravity on a planet decreases, what happens to the weight of an object on that planet? (Weight increases, weight decreases, weight stays the same)
Answer:
1: mass
2:weight
3: gravity increases
4: it decreases
Hope this helps:)
Explanation:
Answer:
Mass, Weight, Strength Increases, and Weight decreases
Explanation:
Got them right on Edge
A 60kg bicyclist (including the bicycle) is pedaling to the
right, causing her speed to increase at a rate of 3.1 m/s2,
despite experiencing a 60N drag. Neglect any friction
impeding her motion.
How many forces are acting on the bicyclist?
What is the magnitude of the net force on the bicyclist?
How much force is the bicyclist generating through her
pedaling?
Final answer:
Two forces are acting on the bicyclist: the 60 N drag force and the pedaling force. The magnitude of the net force is 186 N calculated using Newton's second law. The force generated by the bicyclist through pedaling is 246 N.
Explanation:
To determine the number of forces acting on the bicyclist, we must consider both the drag force and the force generated by the cyclist's pedaling. Two forces are acting on the bicyclist: the pedaling force she generates and the 60N drag force opposing her motion.
To find the magnitude of the net force, we use Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma). We know the mass (m) is 60 kg and the acceleration (a) is 3.1 m/s2, so the net force (Fnet) can be calculated as:
Fnet = m × a
Fnet = 60 kg × 3.1 m/s2
Fnet = 186 N
The pedaling force the bicyclist is generating can be found by adding the drag force to the net force since they are in opposite directions:
Fpedaling = Fnet + Fdrag
Fpedaling = 186 N + 60 N
Fpedaling = 246 N
Thus, the bicyclist generates a pedaling force of 246 Newtons.
A milliliter of very hot water is added to a liter of very cold water. Which of these events will occur? Assume the surrounding air is at room temperature.
a. The cold water will warm to room temperature.
b. The hot water will cool down.
c. The cold water will warm up.
d. The cold water will warm up, but will never reach room temperature.
Answer:b
Explanation:the water will not be hot nomore because of the cold water
What is the source of energy that will send the arrow flying toward the target?
Answer:
When the arrow is pulled back there is both elastic and gravitational potential energy in the arrow. When it is released the elastic potential transfers to kinetic energy and as the arrow moves closer towards the ground gravitational energy is tranferred into kinetic as well.
Answer:
elastic potential energy
Explanation: when the arrow reaches the top of its flight, it has zero kinetic energy and the initial elastic potential energy is now gravitational potential energy of the arrow.
ANSWERS PLEASEEEE
Three runners are jogging from North Augusta to Beech Island. Runner 1 runs 14 miles in 3 hours while Runner 2 runs 16 miles in 4 hours. Runner 3 runs 15 miles in 6 hours. What is the average speed of each runner? Then, get the average speed of all the runners together (total distance/total time)
Explanation:
Given that,
Runner 1 runs 14 miles in 3 hours. His average speed is given by :
[tex]v_1=\dfrac{14\ miles}{3\ h}=4.67\ mph[/tex]
Runner 2 runs 16 miles in 4 hours. His average speed is given by :
[tex]v_2=\dfrac{16\ miles}{4\ h}=4\ mph[/tex]
Runner 3 runs 15 miles in 6 hours. His average speed is given by :
[tex]v_3=\dfrac{15\ miles}{6\ h}=2.5\ mph[/tex]
Total distance covered by all three runners, D = 14 + 16 +15 = 45 miles
Total time taken, t = 3 + 4 + 6 = 13 hours
The average speed of all the runners together is given by :
[tex]V=\dfrac{45\ miles}{13\ h}\\\\V=3.46\ mph[/tex]
Hence, this is the required solution.
Your family decided to go to sea World in San Antonio this weekend. If it takes
your Dad 4 hours to drive to San Antonio, which is 252 miles away, what would be
your Dad's average speed?
A. 48 mph
C. 63 mph
B. 73 mph
D. 58 mph
Answer:
63 mph
Explanation:
252/4 is 63mi
Use the drop-down menus to answer each question about hurricanes.
What helps create the spin in a hurricane?
What is the center of a hurricane called?
Over which kind of water do hurricanes form?
(I tried to get the images in order, sorry if they aren’t. I hope it’s not too confusing.)
Answer:
Yes they are in order
1. coriolis effect
2. eye of the storm
3. warm ocean water
hope that helps :)
Explanation:
The rotational movement within a hurricane primarily stems from the Earth's rotation and a blend of factors influencing the airflow dynamics within the storm system.
What is hurricane?A hurricane, a subtype of tropical cyclones, emerges as a rotating, low-pressure weather system evolving over tropical or subtropical waters. These cyclones exhibit robust winds, heavy precipitation, and storm surges. They can materialize within the Atlantic, Pacific, and Indian Oceans.
The genesis of hurricanes involves the ascent of warm, moisture-laden air from the ocean, culminating in cloud formation. These clouds coalesce into a rotating system encircling a central low-pressure core. As this rotational pattern intensifies and becomes more structured, the storm gains strength. Once the sustained wind speeds reach 74 miles per hour, the system is classified as a hurricane.
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8. When you see a stopped local bus (1 point)
you must stop if you are facing it.
you must stop if you are directly behind it.
wait for its lights to stop flashing.
be alert for pedestrians near the bus.
Answer: be alert for pedestrians near the bus.
Explanation: Due to road accidents many Governments around the world has adopted and put in place certain rules and regulations with regards to road safety, this is so to prevent the or reduce the chances of accidents happening.
Road safety rules are rules and guidelines put in place by Government in order to prevent road accidents and maintain a free flow of traffic. An example of such rules is 'be alert for pedestrians near the bus ' when approaching a local bus that is stopped.
What to do when you see a stopped local bus is;
Be alert for pedestrians near the bus.
This question is dealing with traffic rules as put in place by government to prevent unnecessary accidents and to enhance law and on the roads. Now, when one sees a stopped local bus, it is possible that the bus is stopping for pedestrians to cross if there is a zebra crossing there or trying to pick up passengers. Thus, it is very important for a driver to wait and see or in simpler terms be alert for the pedestrians crossing or entering the bus to avoid accident.Read more at; https://brainly.com/question/21760936
Which situation can strengthen a community's stability?
O
A. Loss of a keystone species
O
B. Interdependence among species
O
c. Removal of a top predator species
O
D. Competition among species for food
Answer:
B
Explanation:
A boy pedals his bicycle with a net horizontal force of 235 N. If the total mass of the boy and the bike is 40 kg, how much are they accelerating
Answer:
force=mass×acceleration
235=40×a235÷40=aa=5.875m/sThe boy and the bike accelerating at 5.875 m/s^2.
What is acceleration?Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).
Given parameters:
Total mass of the boy and the bike : m = 40 kg.
Net horizontal force = 235 N.
Now according to Newton's 2nd law of motion:
Force = mass × acceleration
⇒ acceleration = Force /mass
⇒ acceleration = 235/40 m/s^2
⇒ acceleration = 5.875 m/s^2.
Hence, they are accelerating at 5.875 m/s^2.
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What most likely caused geologists to accept Alfred Wegener’s theory?
A.
After 50 years, the theory became popular.
B.
All hypotheses become theories after a long period of time.
C.
It took scientists a long time to understand Wegener’s ideas.
D.
Evidence supporting the theory slowly accumulated.
Answer:
D. Evidence supporting the theory slowly accumulated
Explanation:
If a theory is accepted over time, it is because other theories were proved wrong and the other theory is accepted because evidence proved them right or wrong.
Answer:
D Evidence supporting the theory slowly accumulated. Is the right answer.
Explanation:If a theory is accepted over time, it is because other theories were proved wrong and the other theory is accepted because evidence proved them right or wrong.
Plese give brainliest
which of the following account for the difference between radio waves , infrared waves, and ultraviolet rays?
A. speed
B. frequency
C. amplitude
D. wavelength
Answer: B
The only difference between these different types of radiation is their wavelength or frequency
Explanation:
Answer:
The answer is B. frequency and D. wavelength for APX.
Explanation:
How many paths do the electrons have to flowlin a series circuit?
You are driving a bus. When you begin your route, there is an old woman named Mrs. Smith and a young boy named Raymond are on the bus. At the first stop, the old woman leaves, and a salesman, named Ed, enters. At the next stop, Jack and his sister Jill get on, as well as three women with shopping bags. The bus travels fifteen minutes, then stops and Raymond gets off and a man and his wife get on. Next, a woman with a bird in a cage gets on the bus. What is the name of the bus driver?
Answer:
you are the bus driver
The driver of a car slams on the brakes, causing the car to
slow down at a rate of 17ft/s2 as the car skids 175ft to a
stop.
How long does the car take to stop?
What was the car's initial speed?
It takes 4.58 seconds for the car to stop and the initial speed of the car is 77.14 ft/s
Explanation:
Given:
Acceleration, a = -17 ft/s²
Distance, s = 175 ft
Final velocity, v = 0
Time, t = ?
Initial speed, u = ?
We know:
v² - u² = 2as
(0)² - (u)² = 2 X - 17 X 175
u² = 5950
u = 77.14 ft/s
To calculate time:
v = u + at
0 = 77.14 - 17 X t
17t = 77.14
t = 4.58 sec
Therefore, It takes 4.58 seconds for the car to stop and the initial speed of the car is 77.14 ft/s
After the driver of a car slams on the brakes, which causes the car to stop after traveling 175 ft with a slow down rate of 17 ft/s², we have:
a) The car stops after 4.54 s.
b) The car's initial speed is 77.14 ft/s.
We can calculate the time at which the car stops with the following kinematic equation:
[tex] v_{f} = v_{i} + at [/tex] (1)
Where:
t: is the time =?
[tex] v_{i}[/tex]: is the initial velocity
[tex] v_{f}[/tex]: is the final velocity = 0 (the car stops)
a: is the acceleration = -17 ft/s² (the minus sign is because the car is slowing down its speed)
First, we need to find the initial velocity.
[tex]v_{i}^{2} = v_{f}^{2} - 2ad[/tex]
Where:
d: is the distance traveled = 175 ft
Then, the initial velocity is:
[tex]v_{i} = \sqrt{v_{f}^{2} - 2ad} = \sqrt{-2(-17 ft/s^{2})175 ft} = 77.14 ft/s[/tex]
Hence, the initial velocity is 77.14 ft/s.
Now, the time at which the car stops is (eq 1):
[tex] t = \frac{v_{f} - v_{i}}{a} = \frac{0 - 77.14 ft/s}{-17 ft/s^{2}} = 4.54 s [/tex]
Therefore, the car stops after 4.54 s.
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what would you expect to happen to the acceleration if all friction were removed from the ramp, making the net force even higher than 600n
Answer:
Increase
Explanation:
The acceleration will increase more if all the friction were removed from ramp.
Acceleration is the rate of change of velocity with time.
Frictional force is a force that opposes motion of a body.
A large friction will reduce the velocity of a body significantly and bring it to stop, a state of no acceleration. When friction is removed, the acceleration of a body will increase significantly since the velocity will change rapidly. At each turn of time, the velocity keeps increasing due to absence of the inhibiting force of friction.Answer:
If friction were removed from the ramp, the acceleration of the skateboarder will increase.
Explanation:
Can you help me??? This is too hard.
Answer:
Vacuum. A sound vacuum was created, i believe.