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Hard physics problem with finding center of gravity

A 70 kg mans arm, including the hand, can be modeled as a 75 cm long uniform cylinder with a mass of 3.5 kg. In raising his both his arms, from hanging down to straight up, by how much does he raise h

What is the net force

A 2.4 kg otter starts from rest at the top of a muddy incline 89.8 cm long and slides down to the bottom in 0.40 s. What net external force acts on the otter along the incline? Answer in units of N-Th

What is a pointer?? in physcis..for measurments

1. Place the object close to the metre ruler, if you cannt do this, you can use a pointer...WWhat is the pointer?? pictures...descriptions...anything ..please help! :D DID I MENTION HOW MUCH I HAT

Physics question, average net force

a ride at an amusement park have magnets that shoot the ride from rest to 45m/s (about 100mi/h) in a time of 7.0s. the combined mass of the car and the riders is 5.5x10E3 kg. find the averag net force

Train physics problem with very few givens.

A 50,000 kg locomotive is traveling at 50.0when its engine and brakes both fail. How far will the locomotive roll before it comes to a stop? This is all I am given. The answer is supposed to be in met

The Physics of Running and Walking

A person runs up several flights of stairs and is exhausted when they get to the top. Later, they walk up the same stairs and do not feel as tired. Why is this? Does it take more work or energy to run

Physics homework question, newtons third law

Consider an airplane that normally has an airspeed of 100-km/h in a 100-km/h crosswind blowing from west to east. Calculate its ground velocity when its nose is pointed north in the crosswind. Having

PHYSICS 100!! PLEASE HELP!!!

A car exits a freeway on a circularly-shaped ramp that is banked at an angle of q = 23.5°. The ramp has a radius of curvature R = 48.6 meters. The ramp is icy, so you can neglect the effects of fricti

If a circuit is in parallel and there is one route with no resistance, will all current pass through it

the other routes have resistors-If you have a 2 lane, toll-road and a 12 lane, non toll-road without speed limit, parallel to it, will all traffic pass through it?-Thats called a short circuit. Yes,

Please explain this solution to a PHYSICS problem to me (Newtons/Dynamics)

So the original problem reads: A 450 kg mass is accelerated at 2.5 m/s² : a) what is the force causing this acceleration? b) how fast is the mass traveling at the end of 3.0 seconds? c) how much dis

Physics Question: involves f=ma

On a banked race track, the smallest circular path on which cars can move has a radius of 116 m, while the largest has a radius of 174 m, as the drawing illustrates. The height of the outer wall is 15

Question on electricity

How come there is more resistance in a circuit with a higher temperature because wouldnt the electrons have more energy to move faster?-Electrons are moved ( drift) under an electric field. Higher te

How much tension must a rope withstand....

How much tension must a rope withstand if it is used to accelerate a 1053 kg car horizontally along a frictionless surface at 1.19 m/s2? please show me how to get the answer, i have a terrible teacher

Is pressing a piano key considered as inertia

My group mates and I have a video project about inertia and we all showed examples about it. My example was pressing a piano key. I was thinking that our teacher might think I am talking about the sou

A closed tube is 50 cm long.

a. What is the length of an open tube that has the same fundamental frequency? b. What is this frequency? c. These two tubes are placed in a gas with a speed of sound greater than the speed of sound i
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