A rock of mass m is twirled on a string in a horizontal plane. The work done by the tension in the string on the rock is:

a. + (positive)

b. - (negative)

c. 0

How do I obtain the poon?

An archer puts a 0.30 kg arrow to the bowstring. an average force of 201 n is exerted to draw the string back 1.3 m. a. assuming no frictional loss, with what speed does the arrow leave the bow? b.

Thus, an object with a momentum of 0 (does or does not have kinetic energy. If an object has a momentum of 10 it (does or does not) have kinetic energy. How do you know?

The shape of an electron cloud is determined by the electrons. True or False

6) Mechanical (sound) waves are unable to travel through a vocuurn, such os through space, but r from satelites How is this possible?

A substance has a density of 13.5 g/cm3. What is the volume of a 50 g block of this substance?

Select all of the answers that apply. Which statements are true regarding the scientific evidence supporting the big bang theory? Researchers found cosmic microwave background radiation, which is a heat imprint left over from the big bang.

How are magnetic poles and electrical charges similar? A. Their same forces repel each other, and their opposite forces attract each other. B. Their same forces attract each other, and their opposite forces repel each other. C.

As part of his meal, a workman has a cup containing a hot drink. In order to keep the drink hot whilst he eats the rest of his meal, he covers the cup, as shown in the figure. Which sources of energy loss does this action reduce? Tick two boxes.

When energy is transformed, the amount of usable energy?