A child kicks a stone along the sidewalk with a force of 520 newtons. The stone travels 1.5 meters in 0.30 seconds. How powerful is the child's kick?

2,600 W

1,700 W

47 W

1.5 W

How much heat is required to raise the temperature of 0.25 C to 30 C?

For the chemical reaction C2H6 - - > C2H4 + H2 + 137kJ, the chemical energy of the A. reactant and the chemical energy of the products are equal. B. reaction cannot be calculated. C. reactant is greater than the chemical energy of the products. D.

Brian has a medical condition called cone dystrophy, which is a disorder of the cone cells in the eye. What symptoms would you expect Brian to have?

A particle moves in a circular path of radius 0.10 m with a constant angular speed of 5 rev/s. The acceleration of the particle is: A. 0.10p m/s2 B. 0.50 m/s2 C. 500p m/s2 D. 1000p2 m/s2 E. 10p2 m/s2

A solid sphere of uniform density starts from rest and rolls without slipping down an inclined plane with angle? = 30o. the sphere has mass m = 8 kg and radius r = 0.19 m. the coefficient of static friction between the sphere and the plane is? = 0.

A space probe is launched from Earth headed for deep space. At a distance of 10,000 miles from Earths center, the gravitational force on it is 381 pounds.

Why are the very first stars thought to have been much more massive than the sun? (a the clouds that made them were much more massive than todays star-forming clouds.

A proton moving at 5.00 106 m/s through a magnetic field of magnitude 1.78 t experiences a magnetic force of magnitude 7.40 10-13 n. what is the angle between the proton's velocity and the field? (enter both possible answers from smallest to largest.

An inductor (L), a resistor (R), a battery (V), and a switch are all connected in a single loop series circuit. Immediately after the switch is closed, a. The current in the circuit is L/R. b.

Which of the following equations can be used to directly calculate an object's impulse? A) p = mvt B) p = m/v C) p = FΔt D) Δp = FΔt