Which one of the following is the pigment found in redheads?

a) Keratin

b) Melanin

c) Pheomelanin

d) Cortex

A 0.10 kg piece of copper at an initial temperature of 95°c is dropped into 0.20 kg of water contained in a 0.28 kg aluminum calorimeter. the water and calorimeter are initially at 15°c.

Suppose that you toss a rock upward so that it rises and then falls back to the earth. If the acceleration due to gravity is 9.

A ball with a mass of 0.25 kg hits a gym ceiling with a force of 78.0 n. what happens next? a. the ball accelerates downward with a force of 80.5 n. b. the ball accelerates downward with a force of 78.0 n. c.

A particle of mass2.5kg moves in a cnservative force field. its potential energy curveis dhwn below. from the curve, detrmine (a) the totalmechanical energy curve particle at x=1.

A 2 kg laptop sits on the floor near a 4 kg jar of pennies. if the force of gravity between them is 3.42 * 10 ⁻¹⁰, how far apart are they?

Two workers pull horizontally on a heavy box but one pulls twice as hard as the other. The larger pull is directed at 25.0 west of north and the resultant of these pulls is 430.0N directly northward.

What would happen to an object in orbit without gravity pulling down?

The waters of a lake will be most layered in which season A. winter B. spring C. summer D. fall

Which of the following is an example of an archery contestant showing good precision but poor accuracy? O A. Hitting a bulls-eye once and then missing a second time O B. Hitting a bulls-eye every time O C.

List and describe two ways currents affect life on earth