A gas hot water heater is 65% efficient. The energy output to heat the water is 2.3 kWh.

Round each answer to the nearest tenth.

The energy input is

kWh.

Therefore,

kWh are lost to the surroundings.

Compare and contrast rutherford's "planetary model" of the atom with our current understanding of an atom's internal structure.

Calculate the momentum for each ocean creature and then answer the question. A 500 kg dolphin swims at 4 m/s. A 700 kg sea turtle swims at 3 m/s. A 1,100 kg shark swims at 1.5 m/s. Which sea creature has the most momentum?

A) Estimate how long it took King Kong to fall straight down from the top of the Empire State Building (380 m high). Express your answer using two significant figures. b) Estimate his velocity just before "landing.

A tennis player player receives a shot with the ball (.06kg) travelling horizontally at 50.0 m/s and returns the shot with the ball travelling horizontally at 40.0 m/s in the opposite direction.

In the parallel spring system, the springs are positioned so that the 37 N weight stretches each spring equally. The spring constant for the left-hand spring is 2.7 N/cm and the spring constant for the righ-hand spring is 4.3 N/cm.

Which medium below conducts sound the fastest? A. a wall B. Steel C. Plastic D. Cardboard

Fariza wears a red hat in her school play. On stage, she is lit by a spotlight shining only green light. When our eyes receive no light from an object, it looks black. Explain why Fariza's hat looks black on stage.

In a chemical reaction, one element replaces another element in a compound to form a new substance. Which of the following best describes this type of chemical reaction? Combustion Neutralization Double Replacement Single Replacement

If the Earth's crust contained twice as much iron as it does, would atmospheric oxygen buildup have been slowed down or sped up during the past 2.

Which of the following statements is true? A. Energy can change from one form to another. B. Matter and energy do not interact. C. Energy cannot be stored. D. Energy does not transfer from place to place.