Physics Answers

Travis Whitcomb wants to purchase a new car with a $25,000 base price and options totaling$2,190. The destination charge is $643. He reads a consumer magazine article that the dealer's cost for the caer is about 91% of the base price and 87.5% of the options price. what should he estmate as the dealer's cost?

Two spherical objects have masses of 4.6x10^7 kg and 7.3x10^5 kg. To he gravitational attraction between them is 90N. How far apart are their centers?

Given the bulk modulus of sea water is 2.2*10^9Pa

and the density of

surface sea water is 1.025*10^3 kg/m^3

Calculate the volume of

1.025*10^3 kg of sea water at a depth near

5 km where the pressure is

5.0*10^7 Pa.

At what temperature will a steel plug of diameter 5 cm at 30 degree celcius fit into a hole of constant diameter 4.9 cm

A steel plug has a diameter of 5cm at 30°c at what temperature will it fit exactly into a hole of constant diameter 4.9cm

1.) A 400 kg piano is lifted to the third story with a set of pulleys. The theoretical mechanical advantage is 4.00.

a.) Calculate the effort required to lift the piano.

b.) If the piano is lifted 10.0 m, how far does the effort move?

c.) How much work is done to lift the piano in 10.0 m?

d.) If the piano is lifted 10.0 m in 30.0 seconds, how much power is developed?

A point charge of q = 4µC is 3cm apart from the charge q 1 = 1µC.

a. Find the magnitude of the Coulomb force which one particle exerts on the other.

b. Is the force attractive or repulsive?

Two like and equal charges are at a distance of d= 5cm and exert a force of F= 9 x 10 -3 N on each other.

a. Find the magnitude of each charge.

b. What is the direction of the electrostatic force between them?

(10%) Problem 7: NASA uses a device often called the "vomit comet" to simulate the effects of low gravity in space during astronaut training. The device moves in circular arcs at a speed of v = 213 m/s.

What is the radius the pilot must fly to create weightlessness as they go around the top of the circular arc? Give your answer in meters.

A person is trying to ride a bike all the way round the inside of

a pipe for a stunt in a film. The filmmaker wants to know what

speeds are involved. The pipe has a diameter of 8 m.

The mass of the bike and rider is 400 kg. The rider goes at a

constant speed of 5 m/s.

a) What is its acceleration at the bottom?

b) What is the force on the bike at an angle of 30° up from the

bottom?

c) What is the minimum velocity at the top for the bike and

rider to stay moving in a circle?

d) Do the bike and rider have sufficient velocity to stay moving

on a circle at the top?�