1. A force acting on an object does no work if

A a machine is used to move the object

B the force is not in the direction of the object's motion

c the force is greater than the force of friction

A stuntman of mass 55 kg is to be launched horizontally out of a spring- loaded cannon. The spring that will launch the stuntman has a spring coefficient of 278 N/m and is compressed 4 m prior to launching the stuntman.

What is a real life example of charging by conduction

In rutherford's gold foil experiment what kind of particles in dense atomic nuclei caused some alpha particles to bounce straight back from the gold foil

One consequence of turbulence is mixing. Different layers of fluid flow cross over one another very easily, and get blended together.

Which has a greater momentum: a heavy truck at rest or a moving skateboard?

Sound waves are mechanical waves in which the particles in the medium vibrate ina direction parrallel to the direction of energy transport. What is another name of the type of wave that transfers energy in this way?

A sound from a source has an intensity of 270 db when it is 1 m from the source. what is the intensity of the sound when it is 3 m from the source?

What experimental term is it when a ruler is dropped to the floor?

Where is most of the energy from incoming waves focused? A. spit B. headland C. underwater D. barrier beach

Exoplanets (planets outside our solar system) are an active area of modern research. Suppose you read an article stating that there is a newly discovered planetary system with three planets.