Anna R.

A 6.1kg bowling ball and a 7.2kg bowling ball rest on a rack 0.75 m apart.  What is the force of gravity exerted on each of the balls by the other ball? G= Universal Gravitational constant = 6.67 x... more

A 15-g CD with a radius of 7.5 cm rotates with an angular speed of 40 rad/s. What is its kinetic energy?

A child pedals a tricycle, giving the driging wheel an angular speed of 0.375 rev/s. if the radius of the wheel is 0.275 m, what is the child's linear speed?

If the angular speed of the Earth as it spins about, its axis is 7.27 x 10-5rad/s. How many rotations the Earth can make in 24 hours?

During a rescue operation, a 6000-kg helicopter hovers above a fixed point.  The helicopter blades send air downward with a speed of 65 m/s.  What mass of air must pass through the blades every... more

Suppose the two speeds of a two canoes after they are pushed apart are 0.60 m/s for canoe 1 and 0.45 m/s for canoe 2.  if the mass of canoe 1 is 350kg, what is the mass of canoe 2?

Two blocks, each of mass m, are connected on a frictionless horizontal table by a spring of force constant k and equilibrium length L. Find the maximum and minimum separation between the two blocks... more

Catching a wave, 77-kg surfer starts with a speed of 1.3 m/s, drops a height of 1.65m, and ends with a speed of 8.2 m/s.  How much non conservative work was done on the suffer?

A 1.2KG block is held against a spring of force constant 1.0x104N/m, copressing it a distance of 0.15m.  How fast is the block moving after it is released and the spring pushes it away?

A 0.14kg pinecone falls 16m to the ground, where it lands with a speed of 13m/s.  With what speed would the pinecone have landed if there had been no air resistance?

A spring with a force constant of 120N/m is used to puch a 0.27kg block of wood against a wall. Find the minimum compression of the spring needed to keep the block from falling, given that the... more

Babe Didrikson holds the world record for the longest baseball throw (93.3m) by the woman.  For the folowing question, assume that the ball was thrown at an angle of 50 degrees above the... more

A 23kg suitcase is being pulled with constant speed by a handle that is at an angle fo 25 degrees above the horizontial. If the normal force exerted on the suitcase is 200N, what is the F applied... more

On vacation, your 1500kg car pulls a 600kg trailer away from the stoplight with an acceleration of 2.0m/s^2, What is the net force exerted on the trailer, what force does the trailer exert on the... more

Driving home from school, you spot a ball rolling out into the street. You brake for 1.30s, slowing your 1000kg car from 17.0m/s to 10.0m/s. What was the average force exeerted on your car during... more