What is the change in internal energy if 20 J of heat is released from a system and the system does 50 J of work on the surroundings?

A.-80 J

B.-20 J

C. 80 J

D. 20 J

How much does mass slow down time?

The boat slightly moves backward when we jump from it. give reason

Of these nonmetals, which one is likely to be the least reactive? oxygen (O) sulfur (S) chlorine (Cl) fluorine (F)

Electric energy can be transferred into other types of energy we often experiences transformation of energy in our every day lives the example that represents a transformation from electrical to sound energy is

After a balloon is rubbed on a sleeve, the balloon is brought near to the metallic plate of an electroscope without touching it. As a result, the rotating needle of the electroscope deflects away from the stationary, vertical support.

True or False: If your gas pedal jams, you should turn the key to lock to lock the steering wheel.

Pylon cables in the National Grid have some resistance. Power (watts) = Current2 (amperes) x Resistance (ohms) Looking at the power equation above, can you explain why transmitting electricity at a very high voltage is beneficial?

A bicycle racer sprints near the end of a race to clinch a victory. The racer has an initial velocity of 12.1 m/s and accelerates at the rate of 0.350 m/s2 for 6.07 s. What is his final velocity?

The current in a wire increases from 5 A to 10 A, what happens to its magnetic field? The field is twice as strong the distance of a charged particle from a wire changes from 10 cm to 20 cm, what happens to its magnetic field?

At a constant pressure and a temperature of 280 K, the gas in a cylinder has a volume of 10.0 liters. If the volume of the gas is increased to 20.0 liters, what is the new temperature? 2800 K 28 K 140 K 560 K