A person with mass 65 kg, standing still, throws an object at 4 m/s. If the

recoil velocity of the person is 3.5 m/s, what is the mass of the object?

Assume the surface to be frictionless.

The work w0 accelerates a car from 0 to 50 km/hr. how much work is needed to accelerate the car from 50 km/hr to 150 km/hr?

The light bulbs in an office building give off tremendous amounts of heat. Since heat is a form of energy, this heat could be trapped and used to offset our need for electricity, thus saving energy and money. True False

Bonnie and Clyde are sliding a 315 kg bank safe across the floor to their getaway car. The safe slides with a constant speed if Clyde pushes from behind with 381 N of force while Bonnie pulls forward on a rope with 363 N of force.

A shell fired into the air explodes into two equal fragments. Which of the following is conserved. a. Kinetic energy b. potential energy c. momentum d. impulse

In which direction does current go according to the electron flow convention?

A boulder on top of a cliff has a potential energy of 12400J. How high above is the boulder?

If the graph represents speed what is measured on the x and y axes

It is difficult to lift a heavy stone than the lighter one on the earth, why?

The vapor pressure of ethanol at 25 degrees C is 7.83 kPa. Calculate the vapor pressure in atm. Round answer to 3 significant digits.

According to Newton's second law of motion acceleration or an object depends upon the ___ of the object and the ___ Acting on it. I'm confused on what the blanks are. I can't find them.