A pulley system used to lift car tires has a mechanical advantage of 8.1. If

you pull on the pulley with a force of 540 N, how much force does the pulley

exert on the tire?

A combination reaction occurs when two or more reactants form one product. A. True B. False

Nova, whose mass is 50kg drops 2 K, what is the amount of heat lost from Nova's body? (specific heat of the human body is 3470 J/kg K)

How many moons does Venus have?

Given that the period of the Moon's orbit about the Earth is 27.32 days and the nearly constant distance between the center of the Earth and the center of the Moon is 3.84 108 m, use T2 = 4 π2 GME a3 to calculate the mass of the Earth.

Which of the following substances would conduct electricity the best? A. an acid that dissociates (dissolves) 100% B. an acid that dissociates (dissolves) 80% C. an acid that dissociates (dissolves) 50% D. an acid that dissociates (dissolves) 10%

a the average distance from the Sun to Pluto is approximately 6.10 x 1 0 ^9. how long does it take light from the sun to reach Pluto?

A 25kg object moves from left to right at a speed of 30km/h. What net force is required to keep this object moving in a straight line at constant speed

Ganymede is one of the many moons of jupiter. it is nearly a sperical in shape. it is larger than the planet mercury and slightly smaller than the planet mars.

Which of the following statements about two carts rolling on a track and experiencing a completely inelastic collision is TRUE? a. The kinetic energy of the system is conserved to good approximation. b.

If element X has 17 protons, how many electrons does it have?