About 50,000 years ago, a meteor crashed into the earth near present-day Flagstaff, Arizona. Measurements from 2005 estimate that this meteor had a mass of about kg (around 150,000 tons) and hit the ground at a speed of (a) How much kinetic energy did this meteor deliver to the ground? (b) How does this energy compare to the energy released by a 1.0-megaton nuclear bomb? (A megaton bomb releases the same amount of energy as a million tons of TNT, and 1.0 ton of TNT releases J of energy.

A person is 170 cm tall. He holds a 10 kg object on his head for 10 minutes. How much work is done on the object?

While I can kick a soccer ball so that it has a speed of 10 m/s, David Beckham can kick a  ball so that it has a speed of 45 m/s. How many times greater is the Kinetic Energy of the ball kicked by Beckham than the ball kicked by me?

A football throws a ball from across the field, this causes the ball to have a change of mass of 1.0 x 10-15 kg. How much energy is the football player exerting?

An object with a mass of m = 2.25 kg is traveling with an initial velocity of v, = (5.40î – 1.40j) m/s. (a) Determine its initial kinetic energy. (Give your answer to at least one decimal place.) (b) Determine the amount of work that must be done on the object in order to change its velocity to v; = (7.00oî + 7.00j) m/s.

In 1953, the US Army field-tested the M65 Atomic Cannon, capable of firing a W9 warhead (364 kg) at a velocity of 333 m/s, whereupon it exploded with energy of 15 kilotons of TNT.  A) In the absence of air resistance, what is the optimal angle for firing the shell? Using your answer, how far would the shell travel? Assume the shell was launched and landed at the same height?   B) How long was the shell in the air?   C) What is the velocity (Magnitute and Direction) of the shell at the top of its trajectory?

please help with questions 32,33 and 34

Suppose that 6 J of work is needed to stretch a spring from its natural length of 36 cm to a length of 47 cm. (a) How much work is needed to stretch the spring from 40 cm to 42 cm? (Round your answer to two decimal places.) 0.20 X J (b) How far beyond its natural length will a force of 35 N keep the spring stretched? (Round your answer one decimal place.) 3.5 cm

"Energy per unit time" is a quantity called Power.  Which of the following combinations has the same units as power? A   length squared times mass over time squared B   persimmons. C   speed times mass times acceleration over time D   Force times acceleration E   {potential energy minus kinetic energy} times time F   Force times velocity G   speed squared times mass H   mass time acceleration I   mass squared times acceleration.

A hiker of mass 73 kg is going to climb to the top of Mount Tam, which has an elevation of 2,574 ft. a) If the hiker starts climbing at an elevation of 545 ft, what will their change in gravitational potential energy be, in joules, once they reach the top? Assume the zero of gravitational potential energy is at sea level.  b) Repeat the above calculation for the change in gravitational potential energy, but assume the gravitational potential is zero at the top of the mountain.