Mechanics | Relativity Answers

write down hooks law.

write down standard equation for current and voltage in alternative current.

explain the constant of elasticity.

Show that the period of a particle that moves in a circular orbit close to the surface of a sphere
depends only upon G and the average density ρ of the sphere. Find what this period would be
for any sphere having an average density equal to that of water.

A large tank is filled with methane gas at a concentration of 0.760 kg/m3. The valve of a 1.40-m pipe connecting the tank to the atmosphere is inadvertantly left open for 13.0 hours. During this time, 8.20x10^-4 kg of methane diffuses out of the tank, leaving the concentration of methane in the tank essentially unchanged. The diffusion constant for methane in air is 2.10x10^-5 m2/s. What is the cross-sectional area of the pipe? Assume that the concentration of methane in the atmosphere is zero.

In exercising, a weight lifter loses 0.110 kg of water through evaporation, the heat required to evaporate the water coming from the weight lifter's body. The work done in lifting weights is 1.49 x 10^5 J. (a) Assuming that the latent heat of vaporization of perspiration is 2.42 x 10^6 J/kg, find the change in the internal energy of the weight lifter. (b) Determine the minimum number of nutritional Calories of food that must be consumed to replace the loss of internal energy. (1 nutritional Calorie = 4186 J).

The Eiffel Tower is a steel structure whose height increases by 19.0 cm when the temperature changes from -9 to +42 oC. What is the approximate height (in meters) at the lower temperature?

A fielder is 110.0 m from home plate when the ball is hit and the ball's trajectory is directly at him. In order to catch the ball at a height of 3.0 m how far does the fielder need to move from their current position.

What is the magnitude of the frictional force (in N) exerted on a plush toy of
0.125 kg which, when thrown on the floor with a speed of 3.60 m / s, travels 2.20 m
before stopping?

A plant pot of mass 3 kg falls from a balcony and drops 10.5 m to the ground. It falls freely under gravity. Find the speed of the plant pot just before it hits the ground.

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