12,726 Answered Questions for the topic physics

Physics

12/16/23

ap physics 1 proportional reasoning
\ An object accelerates from rest at a rate 2A from time t=0 to t=3T . it then accelerates at a new rate 4A from time t=3T to t=5T. What expression represents the displacement of object over time... more
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Physics

12/14/23

7. two charges q₁=4μc and q₂=-7μc are by 5m. calculate the electric potential at point a. (Physics subject) Po
7. two charges q₁=4μc and q₂=-7μc are by 5m. calculate the electric potential at point a. (Physics subject)
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Physics

12/14/23

Equilibrium - Rotational Motion (Upward Force)
A 5.77 kg rod is 0.625 m long, and attached at one end to a wall with a hinge, so it can be rotated up and down. How much upward force must you exert at the end of the rod to hold it horizontal?
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Physics

12/13/23

Equilibrium: Rotational Motion

A 2150 kg drawbridge, 8.74 m long, is held up by a chain attached to the end. The chain makes a 51.0 degree angle. What force does the chain exert? (Don't forget: w=mg, at the center of the... more
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Physics Math

12/13/23

Question about the maths of e=mc^2 derivation (using special relativity formula)
Please solve this with every single step, I don't get the addition of the expressions given above, where did the cos phi go? I am just confused as to how these expressions were added, please add... more
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Physics

12/13/23

Watts problem-have the answer please help explain!
An elite Tour de France cyclist can maintain an output of 470 Watts during a sustained climb. At this output power, how long would it take a 84 kg cyclist (including the mass of his bike) to climb... more
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Physics

12/13/23

Waterfall physics problem-Help me get to answer!
Consider a waterfall with the river water flowing horizontally off of a cliff at 2.1 m/s before falling 120 m to a lake below. After leaving the cliff it takes the water 4.9 seconds to fall to the... more
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Physics

12/13/23

Slowing down boats-have answer need help getting to it!
Sam’s job at the amusement park is to slow down and bring to a stop the boats in the log ride. The boat and its riders have a mass of 910kg . If he applies a constant 445N force and stops the boat... more
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Physics

12/12/23

Roller coaster and speed-have answer need help getting there.
A roller coaster starts from rest at its highest point and then descends on its (frictionless) track. Its speed is 34 m/s when it reaches ground level. What was its speed when its height was half... more
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Physics

12/12/23

Dart-gun and spring problem-have answer need help getting there.
A dart is loaded into a dart gun, compressing the spring by 7.5 cm. If the spring constant k = 24 N/m, how fast does the 8 g dart go when it is fired (spring is released)?Answer: 4 m/s
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Physics

12/12/23

Firefighter and Thermal Energy-Have the answer need help getting there!
A 65 kg firefighter, starting at rest on the upper floor, slides 6.0 m down a fire pole to the ground. If just before touching the ground, her speed is 2.0 m/s much energy went into thermal energy... more
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Physics

12/12/23

Magnitude done by Kinetic Friction-Have answer need help getting there.
A box weighing 12 N has an initial speed of 2.1 m/s. As it slides acrossa level floor it comes to a stop in 3.2 m due to kinetic friction. What is the magnitudeof the work done by the kinetic... more
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Physics

12/12/23

RLC Circuit help
In an RLC circuit:R = 2 OmegaL = 3 HC = 8 FA phasor diagram is drawn for this circuit and it is found that:the phasor for the inductor is 3 times longer than the phasor for the resistorthe phasor... more
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Physics

12/10/23

Ferris wheel, centripetal force!

A physics student decides to take a ride on an Ferris wheel, The wheel has a diameter of 12 m and spins at a constant rate making three complete revolutions per minute. (i) Determine the speed of... more
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Physics

12/09/23

I'm Not Sure How to Solve This Physics Problem
Two planets in circular orbits around a star have speeds of v and 7v. (a) What is the ratio of the orbital radii of the planets? (b) What is the ratio of their periods?
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Physics

12/08/23

Conservation of Energy question PLEASE HELP ASAP
A block of mass 2-kg is sliding on a frictionless surface with speed 7 m/s. It reaches an incline surface, on which there is a spring with spring constant of 100 N/m. The block moves up a distance... more
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Physics

12/08/23

Linear momentum question HELP ASAP
A 10-g bullet moving directly upward at 500 m/s hits and passes through the centre of mass of a 4-kg block initially at rest, as shown in the figure. The bullet emerges from the block moving... more
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Physics

12/08/23

I Don't Know How To Solve This Physics Problem
Duende has an elliptical orbit about the Sun, with a perihelion distance of 0.829 AU and aphelion distance of 0.992 AU. What is the period of its orbit (in years)?
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Physics

12/07/23

Velocity and position!

Lisa and mary take two balls to a bridge. At the same instant, the red ball is dropped from rest from the bridge, and the green one is tossed vertically up, Both of them fall toward the ground... more
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Physics

12/07/23

Mass and its relationship with velocity!

While practicing your curling technique, You have two curling stones, Stone A with mass m and stone B with mass 2m. If you push each of them forward (starting from rest) with same constant force... more
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Physics

12/07/23

Work done in physics

A crane at a construction site slowly lowers a concrete pillar hanging from a vertical steel cable. The pillar descends with constant velocity. For each of these following statements, mark if they... more
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Physics

12/07/23

Angular momentum question HELP ASAP
A bullet of mass 200 g is shot with 𝑣 = 100 𝑚 𝑠 toward a block of mass 2 kg that is placed on a frictionless table. The block is connected to rod of negligible mass and length 2 m, which is pinned... more
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Physics

12/07/23

I Need Some Help With This Physics Problem
Calculate the mass (in kg) of the Sun based on data for Uranus's orbit. (Use G = 6.67 ✕ 10−11 N · m2/kg2 in your calculations. Round your answer to at least four significant figures.) Also, compare... more
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Physics

12/07/23

Please Solve This Physics Problem
(a) Evaluate the gravitational potential energy (in J) between two 9.00 kg spherical steel balls separated by a center-to-center distance of 22.0 cm.(b) Assuming that they are both initially at... more
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Physics

12/07/23

Solve This Physics Problem
If a planet with 7.7 times the mass of Earth was traveling in Earth's orbit, what would its period be (in years)?
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