capa physics set 8

1. [1pt]

The total mass is 2300kg (weight = 5072lbs). Find the size of the force due to wind and rolling friction when the van speed is 42.82mph (1mph= 0.447m/s).

prob09a_1004minivan.gif

2. [1pt]

How much net power, in hp (1 hp=746W) must the engine deliver to maintain a speed of 42.82mph (19.14m/s) (Neglect losses involved in delivering the power).

3. [1pt]

Select T-True, F-False, for each statement. If the first is T and the rest F, enter TFFFFF.

A) Work can be done in the absence of motion.

B) Energy is required to do work.

C) Less power is required while lifting a box up quickly than while slowly lifting it.

D) Work is done when the form of energy changes.

E) Without friction, the sum of the potential and kinetic energies of a body is constant.

F) Energy conservation law for a projectile (no friction): Potential energy increase equals the kinetic energy decrease.

4. [1pt]

M1 is a spherical mass (43.4 kg) at the origin. M2 is also a spherical mass (11.2 kg) and is located on the x-axis at x = 52.8 m. At what value of x would a third mass with a 16.5 kg mass experience no net gravitational force due to M1 and M2?

5. [1pt]

Calculate the magnitude of the gravitational force between the earth and a 3.400-kg mass on the surface of the earth. The distance to the center of the earth from the surface is 6370 km and the mass of the earth is 5.98e+24 kg.

6. [1pt]

Calculate the magnitude of the gravitational force between the moon and a 3.400-kg mass on the surface of the earth nearest to the moon. The distance to the center of the moon from the surface of the earth is 376,000 km and the mass of the moon is 7.36e+22 kg.

7. [1pt]

The escape velocity of a bullet from the surface of planet Y is 1727 m/s. Calculate the escape velocity from the surface of the planet X if the mass of planet X is 1.51 times that of Y, and its radius is 0.855 times the radius of Y (in m/s).

 8. [1pt]

Find the speed of a satellite in a circular orbit around the earth with a radius 3.59 times the mean radius of the earth; RE 6.37E+3km; ME 5.98E+24kg.

9. [1pt]

A satellite is in a circular orbit around the earth. The period of the satellite is 22.0 hr. Calculate the radius of the orbit of the satellite. Data: Mass of the earth = 5.98 e+24 kg.