A girl performs 300 J of work lifting a weight to a height of 2 m. How much

force does she apply? Assume there is no friction.

O

A. 150 N

O B. 600 N

O C. 450 N

O D, 300 N

A football player whose mass is 49.9 kg is running at 5.78 m/s. The momentum of the player is ___ kg•m/s

Which of these has the most chemical energy? A. a candy bar B. a gold brick C. a gallon of milk D. a gallon of gasoline

When a hair dryer is being used, one of the energy transformations that takes place is A) electrical to chemical. Eliminate B) electrical to mechanical. C) mechanical to electrical. D) chemical to electrical.

Watching television, with theremote control in your hand, which of the following exerts the greatest gravitational force on you? A) The couch you are sitting on B) The TV actors tne room C) The moon D) The remote control in your hand

Any wave of any kind will change direction when it encounters an obstacle. This bending is called

What organelle is found in all animal cells and some plant cells

Basic of Archimedes's principle of how fluid can make body to float and sink.

A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average force (in N) exerted on a 0.0500 kg bullet to accelerate it to a speed of 625 m/s in a time of 1.10 ms (milliseconds)

Your boss at the Cut-Rate Cuckoo Clock Company wants to save money on materials. You are asked to reduce the balance wheel, which is cylindrical, dimensions to one-third their original values.

Which of the following conditions is not necessary to observe an interference pattern between two sets of waves? A) The waves must have the same wavelength. B) The waves must have a constant phase difference.