Which of the following is a physical change?

A.) sawing a piece of wood.

B.) burning a piece of wood.

C.) rust forming on an iron fence.

D.) a copper roof changing color from green to red.

A hockey player uses her hockey stick to exert a force of 7.957.95 N on a stationary hockey puck, which is resting on a nearly frictionless ice surface. The hockey puck has a mass of 181181 g. What is the acceleration of the hockey puck?

The velocity function (in meters per second) is given for a particle moving along a line. v (t) = 5t - 9, 0 ≤ t ≤ 3 (a) Find the displacement. - 9/2 Correct: Your answer is correct.

A 60 W lightbulb is on for 24 hours. A stereo with a power of 150 W is on for 2 hours. Which statement correctly compares the energy used by these devices?

A circular loop of wire with radius 2.00 cm and resistance 0.600 Ω is in a region of a spatially uniform magnetic field B⃗ that is perpendicular to the plane of the loop. At t = 0 the magnetic field has magnitude B0=3.00T.

Find the applied voltage of a telephone circuit that draws 0.017 amps through a resistance of 15,000 ohms.

What two qauntities must be known to calculate the density of a sample of matter

An element's atomic number is 38. How many protons would an atom of this element have?

What's are some forms of chemical energy

True or false a liquid does not have a definite shape, but it does have a definite volume.

HOw are ferns and trees alike and different and what would survive longer without rain fern or tree