A uniform rod XY of weight 10.0N is freely hinged to a wall at X. It is held horizontal by a force F acting from Y at an angle 30° to the horizontal, as shown.
What is the value of F?
A- 5.0 N B- 8.7cm C- 10.0cm D-20.0cm
what type of simple machine is a catapult?( incline plane , lever , pulley , screw , wedge, or a wheel and axle) How do you know ?
Answer: Lever
Explanation:
A catapult as a machine is a lever (1st class) because the fulcrum is between the Effort applied and the load(object) to be launched. A first class lever machine is a machine that has the fulcrum in between the effort and the load which makes a catapult a first class lever.
The handle of the catapult is where the effort is applied, the fulcrum is the point of contact between the rubber tied to the stick and the stick itself and the load is the object to be launched.
A catapult is a type of lever because it uses a rigid arm that pivots around a fixed point to launch a projectile.
A simple machine known as a lever is made up of a rigid bar or board that pivots around a fixed point, also known as a fulcrum. The fulcrum of a catapult is the location where the weapon's arm is joined to the base.
Potential energy is stored in the system when the catapult's arm is retracted. Potential energy is transformed into kinetic energy when the arm is released, which causes the arm to swing forward and fire the projectile.
Seesaws, scissors, and crowbars are a few examples of machines that utilize the lever concept. The lever enables the application of a little force over a longer distance to produce a bigger force over a shorter distance.
Therefore, a catapult is a type of lever. The correct answer is lever. An example of a lever is a catapult.
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What does the Energy Independence and Security Act of 2007 mandate? A. more use of fossil fuels
B. more use of heavy cars
C. more fuel efficient cars
Answer: C
The Energy Independence and Security Act of 2007 mandates the use of more fuel efficient cars where car manufacturers are required to boost fleet wide gas mileage to 35 mp (14.8 km/l) by 2020 in order to help reduce petroleum consumption. It encourages the increase in fuel economy standards for passenger cars. Thus, promote production of fuel-efficient vehicles. Additionally, the act also support the use of electric transportation technology.
The answer is C. more fuel efficient car.s
A completely ionized beryllium atom (net charge = +4e) is accelerated through a potential difference of 6.0 v. what is the increase in kinetic energy of the atom?
Final answer:
The increase in kinetic energy of a completely ionized beryllium atom accelerated through a potential difference of 6.0 V is +24 electron volts (eV).
Explanation:
To calculate the increase in kinetic energy of a completely ionized beryllium atom accelerated through a potential difference of 6.0 V, we need to use the formula:
ΔK = q × ΔV
Where ΔK is the increase in kinetic energy, q is the charge of the ion, and ΔV is the potential difference. In this case, the beryllium atom is completely ionized with a net charge of +4e, where e is the elementary charge. Therefore, the charge (q) is +4e.
Substituting the values, ΔK = (+4e) × (6.0 V) = +24eV
So, the increase in kinetic energy of the atom is +24 electron volts (eV).
which theory of plate movements involves magma rising all the way from the lower mantle to spread apart plates
Answer:
hot plumes
Explanation:
After walking across a carpeted floor in socks, Jim brings his finger near a metal doorknob and receives a shock. what does that demonstrate
Electric forces can act at a distance
Calculate the momentum of a 953kg elephant running at a rate of 3.85 m/s.
give an example of a situation in which you would describe an object's position in
A rotating fan completes 1100 revolutions every minute. consider a point on the tip of a blade, at a radius of 0.18 m. through what distance does the point move in one revolution?
Match the cloud type with its description.
1.
cumulus
resembles an overcast sky; layers of gray or white clouds
2.
altostratus
clouds nearest Earth's surface
3.
cirrus
look like wispy feathers high in the sky
4.
nimbostratus
dark, thick-layered clouds; rain's coming
5.
fog
look like pieces of cotton in the sky
You exert a horizontal force on a heavy piano that rests on a carpeted floor. the piano doesn't budge. if the force you exert on the piano is the "action", what force is its reaction?
Answer:
it will cruch you so the piano exerts on you
Explanation:
Sally and Maria were running around the track during PE. They were not happy and decided to stop and rest once they got to the bleachers. After a 10 minute rest, they started running again, but Sally tripped and fell. At what time during their run did Sally fall for a minute? A) at 4 minutes B) at 14 minutes C) at 15 minutes D) at 20 minutes
Answer:
The answer is A.) 4 minutes
Explanation:
If you look at the graph they started at 15 and when they took a rest it was at 4 mins.
Answer:
B)15 Minutes
The line becomes straight for one min at the fifteen min marker.
Hope this helps
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I need help with this asap please
A water wave vibrates up and down four times each second, the distance between two successive crests is 5 meters, and the height from the lowest part to the highest part of the wave is 2 meters.
a. What is the frequency of the wave in hertz?
b. What is the period of the wave in seconds?
c. What is the speed of the wave in meters per seconds?
d. What is the amplitude of the wave in meters?
The frequency of the wave is 4 Hz, the period is 1/4 seconds, the speed is 20 m/s, and the amplitude is 2 meters.
Explanation:a. The frequency of the wave can be calculated by counting the number of complete vibrations in one second. In this case, the wave vibrates up and down four times each second, so the frequency is 4 Hz.
b. The period of the wave is the time it takes for one complete vibration. It can be calculated by taking the reciprocal of the frequency. In this case, the period is 1/4 seconds.
c. The speed of the wave can be determined by multiplying the frequency by the wavelength. Since the distance between two successive crests is 5 meters, the speed of the wave is 20 m/s.
d. The amplitude of the wave is the height from the lowest part to the highest part of the wave. In this case, the amplitude is 2 meters.
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How much work does the electric field do in moving a proton from a point with a potential of +125 v to a point where it is -55 v? express your answer both in joules and electron volts?
The work done by the electric field in moving a proton from +125V to -55V is -expressed as -180 electron volts (eV).
Using the relationship between work (W), charge (q), and electric potential difference (V).
The charge of a proton is +1.602 × 10^-19 coulombs (elementary charge, e), and the potential difference
V is the final potential minus the initial potential.
So, we compute the potential difference first:
V = V_final - V_initial = (-55V) - (+125V) = -180V
Then, we calculate the work done:
W = q
V = (1.602
10^-19 C)
(-180 V) = -2.8836
10^-17 joules
The negative sign indicates that the electric field is doing work against the electric potential. To express the work in electron volts, remember that 1 eV = 1.602
10^-19 joules:
W (in eV) = W (in joules) / (1.602
10^-19 joules/eV)
= (-2.8836
10^-17 joules) / (1.602
10^-19 joules/eV) = -180 eV
Determine which heat transfers below are due to the process of conduction. I) You walk barefoot on the hot street and it burns your toes. II) When you get into a car with hot black leather in the middle of the summer and your skin starts to get burned. III) A flame heats the air inside a hot air balloon and the balloon rises. IV) A boy sits to the side of a campfire. He is 10 feet away, but still feels warm.
Answer:
I) You walk barefoot on the hot street and it burns your toes.
II) When you get into a car with hot black leather in the middle of the summer and your skin starts to get burned.
Explanation:
In conduction mode of heat transfer we know that the energy is transferred from one system to other system due to direct contact of two bodies
Here due to this direct contact the energy is transferred via a given solid or liquid medium
In this type of heat transfer medium particles will remain in its own position only the energy is transferred.
So here we can say the correct answer will be
I) You walk barefoot on the hot street and it burns your toes.
II) When you get into a car with hot black leather in the middle of the summer and your skin starts to get burned.
A 616 g block is released from rest at height h0 above a vertical spring with spring constant k = 540 n/m and negligible mass. the block sticks to the spring and momentarily stops after compressing the spring 23.3 cm. how much work is done (a) by the block on the spring and (b) by the spring on the block? (c) what is the value of h0? (d) if the block were released from height 2h0 above the spring, what would be the maximum compression of the spring?
Bob is studying waves in science and learns that the energy of a wave is directly proportional to the square of the waves amplitude. If the amplitude of a wave changes from 2m to 1m, what should he predict as the effect on energy of the wave? A) The energy is halved. B) The energy is doubled. C) The energy is quartered. D) The energy is quadrupled.
Answer:
It's C
Explanation:
Since E ∝ amplitude2 then as the amplitude is halved the energy is quartered.
Plugging in to check
amplitude2=E
22=4
12=1
A tennis ball is thrown from ground level with velocity directed 30° above the horizontal. if it takes the ball 0.5 s to reach the top of its trajectory, what is the magnitude of the initial velocity?
Using the equation of motion v = u + gt and knowing that at the top of its trajectory the final velocity of the ball is 0, the time it takes to reach there is 0.5 seconds and the acceleration due to gravity is -9.8 m/s², we can determine the magnitude of the initial vertical component of the velocity to be 4.9 m/s. As the ball was thrown at a 30° angle, this means the magnitude of the initial velocity is 9.8 m/s.
Explanation:In order to find the initial velocity of a projectile, we can use a foundational equation from Physics. Specifically, the formula v = u + gt where v is the final velocity, u is the initial velocity, g is acceleration due to gravity, and t is time. We're told that the ball takes 0.5 seconds to reach the top of its trajectory. At the top of its trajectory, the ball's final velocity will be 0 m/s (because it momentarily stops before falling back down). Also, the acceleration due to gravity is -9.8 m/s². Re-arranging the formula to solve for u gives us u = v - gt. Replacing v with 0, g with -9.8 m/s², and t with 0.5 s gives u = 0 - (-9.8 m/s² * 0.5s) = 4.9 m/s. However, this 4.9 m/s is just the vertical component of the initial velocity, because gravity acts vertically. Since the balls is thrown at an angle of 30°, to get the magnitude of the initial velocity, we have to divide 4.9 m/s by sin(30°) which gives us roughly 9.8 m/s. Therefore, the magnitude of the initial velocity is approximately 9.8 m/s.
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A circuit contains a single 270-pf capacitor hooked across a battery. it is desired to store four times as much energy in a combination of two capacitors by adding a single capacitor to this one. what would this value be
How are stone tools or sharp sticks technology
Stone tools and sharp sticks are early technologies that required technical skills and knowledge for their creation and use.
Stone tools and sharp sticks are considered technology due to the technical skills and knowledge required for their creation and usage. The development of stone tools, such as the Oldowan tools, marked a significant advancement in human engineering abilities, enabling tasks like cutting, scraping, and butchering. Furthermore, innovations like hafting, attaching blades to shafts, showcase the early human understanding of materials and design.
The water cycle is a biogeochemical cycle that is a closed system. Which of these sentences describes a viable stage that occurs in the water cycle?
(A)Water enters and exits the system boundaries of the cycle.
(B)Water can change from solid to liquid at certain points in the cycle.
(C)Ice forms anew, adding matter to the cycle.
(D)Water vapor condenses, subtracting energy from the cycle.
Answer:
b
Explanation:
The water cycle is a biogeochemical cycle that is a closed system. the statement describes a viable stage that occur in water cycle is that water can change from solid to liquid at certain points in the cycle. therefore the correct answer is option B.
What is hydropower?A dam or other construction that alters the natural flow of a river or other body of water is used to generate hydropower, often known as hydroelectric power.
Hydropower utilizes the endless water cycle, which uses water as fuel and produces no waste products, to produce electricity. Hydropower plants come in a variety of shapes and sizes, but they are always constantly pushed by the kinetic energy of water going downstream.
In a closed system, the water cycle is a biogeochemical cycle. The fact that water can transform from solid to liquid at specific periods during the cycle is described in the phrase as a possible stage that occurs in the water cycle.
Thus, the correct answer is option B.
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Which type of simple machine is pictured here?
1. wedge
2. inclined plane
3. lever
4. wheel and axel
THANK YOU I NEED THIS DONE BY 10:30 2/23/2018
Answer: This thing is a lever
Explanation: There isn't a picture, but I took the K12 class, so yeah
The simple machine with a rod fixed to the center of a wheel is a wheel and axle, which is a type of lever used to multiply applied force.
Explanation:The simple machine pictured that consists of a rod fixed to the center of a wheel is known as a wheel and axle. This device is actually a form of lever where the force applied to the wheel results in a greater force being applied to the axle. It exemplifies how simple machines can be used to multiply or augment a force that we apply. The mechanical advantage is calculated by dividing the radius of the wheel by the radius of the axle.
Sugar mixed in water is an example of a _______________ .
A colloid
B suspension
C pure substance
D solution
E heterogeneous mixture
Answer:
option D is correct. It is a solution.
Explanation:
A physical change occurs when sugar dissolves in water. It is due to the fact that no new substance is formed.the process is reversible.as sugar is solute.water is solvent.What is solute?A solute is a substance that dissolves in a solution. A solvent and one or more solutes make up every solution.
hence, option D is correct. It is a solution.
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Marta, Cato, and Juan plan a skit to illustrate one of the methods of charging.
Marta and Cato are walking together. Each has one flower and one box of candy.
Juan offers Cato a huge bouquet of flowers, but Cato can’t take it because his hands are full.
Cato hands his flower to Marta and then turns to Juan to take the bouquet.
Marta walks away in one direction with two flowers and one box of candy. Juan keeps the bouquet and walks away in the other direction. Cato looks sad standing alone with only a box of candy.
How does the skit model a method of charging?
a It models induction because an electron (a flower) transfers from Cato to Marta through direct contact.
b It models friction because an electron (a flower) transfers from Cato to Marta through direct contact.
c It models friction because the offer of flowers represents a charged object that causes an electron (a flower) to transfer from one object to another.
d It models induction because the offer of flowers represents a charged object that causes an electron (a flower) to transfer from one object to another.
The answer is C. Frictional charging is primarily involved. In the scenario, the bouquet of flowers represents a charged object that causes an electron (or the flower) to transfer from one object to another. Due to the bouquet of flowers, the other flower repelled and moved towards the object with a lesser charge. As a result, the box becomes neutral or has no charge at all.
The answer is D.
I just took the test and got it right
.
Rank the following from smallest current to largest current.
A 1200W microwave connected to 110V outlet.
I=P/U=1200/110=10.9 A
A 1500W water heater connected to 220V outlet.
I=P/U=1500/220=6.8 A
A 100W light bulb connected to 110V outlet.
I=P/U=100/110=0.9 A
A 2000W oven connected to a 220V outlet.
I=P/U=2000/220=9.1 A
A 40W Light bulb connected to a 12V battery.
I=P/U=40/12=3.3 A
Explanation:
The power of an electrical appliance is given by :
[tex]P=V\times I[/tex]
Where
V is the voltage source
I is the current flowing in the circuit
1. For 1200 W microwave, Current, I = 10.9 A
2. For 1500 W water heater, Current, I = 6.8 A
3. For 100 W light bulb, Current, I = 0.9 A
4. For 2000 W oven, Current, I = 9.1 A
5. For 40 W light bulb, Current, I = 3.3 A
Out of the above five appliances, the largest current is flowing in microwave and the smallest current is flowing in the light bulb.
So, the sequence from smallest current to the largest current is :
100 W light bulb ( 0.9 A) < 40 W light bulb (3.3 A) < 1500 W water heater (6.8 A) < 2000 W oven (9.1 A) < 1200 W microwave (10.9 A)
An 80 N force has been applied to a block and move it 20m along the direction of the force.
what is the definition of work when net force is parallel to the distance?
After watching an advertisement for hand sanitizer on television, Ben decided to see just how effective the advertised hand sanitizer really was. Ben used warm water as his control. He compared the advertised sanitizer with two brands of hand soap. In all four trials he rubbed his hands together for two minutes. After using the three products and the control, he cultured the bacteria on his hands. He recorded the number of bacterial cultures that appeared on each culture plate. Ben's results can be seen in the data table. Ben concluded that both brands of soap were more effective in killing bacteria than the advertised hand sanitizer. What term BEST describes Ben's results for all four trials? A) biased B) inconclusive C) qualitative D) quantitative ASAPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP
Answer:
answer is quantitive this guy is wrong
Explanation:
did it on usatestprep
A proton beam in an accelerator carries a current of 130 μa. if the beam is incident on a target, how many protons strike the target in a period of 17.0 s?
Final answer:
Using the formula relating current, charge, and time, approximately 1.38 × 10^16 protons strike a target when 130 μA of current is directed at the target for 17.0 seconds.
Explanation:
To determine how many protons strike the target in 17.0 seconds with a current of 130 μA (microamperes), we must understand the relationship between electric current, charge, and the quantity of charged particles. Current (I) is defined as the amount of charge (Q) passing through a point in a circuit per unit of time (t), mathematically described by the equation I = Q/t. Given that each proton carries a charge of approximately 1.6 × 10-19 C (coulombs), we can find the total charge that strikes the target over 17.0 seconds and subsequently calculate the number of protons involved.
First, convert the current from microamperes to amperes: 130 μA = 130 × 10-6 A. Then, use I = Q/t to find the total charge Q: Q = I × t = (130 × 10-6 A) × 17.0 s = 2.21 × 10-3 C. Finally, calculate the number of protons by dividing the total charge by the charge of a single proton: Number of protons = Q / charge of one proton = (2.21 × 10-3 C) / (1.6 × 10-19 C/proton) ≈ 1.38 × 1016 protons.
Therefore, approximately 1.38 × 1016 protons strike the target in a period of 17.0 seconds.
Consider the vector b⃗ with magnitude 4.00 m at an angle 23.5∘ north of east. what is the x component bx of this vector? express your answer in meters to three significant figures.