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Q. A cable lifts a 1270-kg elevator at a constant velocity for a distance of 49.7 m. What is the work done by (a) the tension in the cable and (b) the elevator's weight?
Q. Suppose the roller coaster (h1 = 34 m, h2 = 13 m, h3 = 30) passes point A with a speed of 3.10 m/s. If the average force of friction is equal to one third of its weight, with what speed will it reach point B? The distance traveled is 50.0 m.
A 71 kg skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m. If the skier's speed at point A is 7.0m/s , what is the normal force exerted by the snow on the skier at point B? Ignore fricti..
A 1000 kg aircraft going 25 m/s collides with a 1500 kg aircraft that is parked and they stick together after the collision and are going 10 m/s after the collision. If they skid for 5.4 seconds before stopping, how far did they skid?
All distant galaxies are moving away from us. Describe why this does not imply that we are at the center of universe.
A hot air balloon is rising straight up with a speed of 6.0 m/s. A ballast bag is released from rest relative to the balloon when it is 9.54 m above the ground. How much time elapses before the ballast bag hits ground.
A basketball of mass 610g and circumference 76cm is rolling without slipping on a gym floor. Treating ball as a hollow sphere, what fraction of its total kinetic energy is associated with its rotational motion.
A robot probe drops a camera off the rim of the 389 m high cliff on Mars, where the free fall acceleration is 3.7 m/s^2. Find out velocity with which it hits the ground and the time required for it to reach the ground.
assume a bar 2 m long expands 0.6 cm when heated. By how much will a bar 100 m long of the same material expand when similarly heated.
What least heat is needed to bring 80 of water at 20 to the boiling point and completely boil it away? (answere in Joules).
How does the magnitude of electrical force between a pair of charged objects change while the objects are moved twice as far apart? Three times as far apart.
Much of the material making up Saturn's rings is in the form of tiny dust grains having radii on the order of 10-6 m. These grains are located in a region containing a dilute ionized gas, and they pick up excess electrons. As an approximation, sup..
A 36 g ball is fired horizontally with initial speed v_0 toward a 110 g ball that is hanging motionless from a 1.1 m-long string. The balls undergo a head-on, perfectly elastic collision, after which 110 g ball swings out to a maximum angle theta_..
Blocks with masses of 4.0, 8.0, and 9.0 are lined up in a row on a frictionless table. All three are pushed forward by a 16 force applied to the 4.0 block. How much force does the 8.0 block exert on the 8.0 block.
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