A transformer supplies 60 watts of power to a device that is rated at 20 volts. The primary coil is connected to a 120-volt ac source. What is the current I1 in the primary coil

A bike travels at a constant speed for 4.00 m/s for 5.00 seconds. How far does it go

Which of the following reactions release more energy? fusion reactions nuclear chain reactions fission reactions chemical reactions

Electromagnetic waves transfer energy from a warmer object to a cooler object, with or without

A particle moving along the x-axis has its position described by the function x = (3.00t3-1.00t 2.00) m where t is in s. at t = 4.00 s what is the particle's velocity?

A 300 kg car travels at 11 ms. What is the momentum

An object has a mass of 8.00 kg. What is the gravitational force on the object by the earth?

Which of the following best characterizes the free energy change ΔG for an endothermic reaction under physiological conditions? A. The sign of ΔG is positive B. The sign of ΔG is zero C. The sign of ΔG is negative D.

In a recent hockey game, one player (m=100kg) was moving at a velocity of 8 m/s when he ran into another player (m=300kg) who was at rest (v=0m/s). After the collision, the two players were stuck together (moving with the same velocity).

In a laser, electrical energy is changed to light energy, and a small amount of the energy is wasted as heat. Describe the total amount of the heat in the system (using the conservation of energy).

What is the name for a star and planets held together by gravity? A. solar system B. galaxy C. black hole D. supernova