A 5 kg weight is hung from a vertical spring. The spring stretches by 5 cm. How much mass should be hung from the spring so it will stretch by 10

cm from its original length?

15 kg

25 kg

10 kg

20 kg

Why isn't earths moon considered a planet

A grandfather clock is constructed so that it has a simple pendulum that swings from one side to the other, a distance of 27.0 mm, in 1.00 s. What is the maximum speed of the pendulum bob?

An object with a positive velocity and a negative acceleration will ...

True or false, only a radioactive isotope will have a half-life

Which of the following statements is FALSE about collisions? (Consider Newton's Laws an the Conservation of Momentum.

A spring has a spring constant of 120 newtons per meter. Calculate the elastic potential energy stored in the spring when it is stretched 2.0 centimeters.

In pottery class, you throw a pot from a lump of wet clay. your pot's mass is 5.5 kg. after the pot is fired, it's mass is 4.9 kg. the density of wet clay is 1.60 g/cm3 and the density of fired clay is 1.36 g/cm3.

When you catch a baseball, what kind of work do you do, negative or positive? By catching the baseball, what do you change? Does the baseball gain or lose energy? What kind of energy?

A man finds that he has a mass of 100.6 kg. He goes on a diet, and several months later he finds that he has a mass of 96.4 kg. Express the mass 100.6 kg in scientific notation.

A bird has a kinetic energy of 3 J and a potential energy of 25 J. What is the mechanical energy of the bird?