A 2-kW resistance heater in a water heater runs for 3 hours to raise the water temperature to the desired level. Determine the amount of electric energy used in both kWh and kJ.

You need to measure the lengthof you driveway. which measuring tool would produce accurate results that would expect to be the same as those found by others A your hands span B a string cut to the length of the tip of you finger to the bottom of

Technician A says a respirator will block all poisonous fumes produced in a shop. Technician B says a respirator will block only those fumes for which it is rated. Who is right?

The greater the change in speed, the less the light wave is reflected. True or false? Explain.

a car is moving in a circular horizontal track of radius 10 m with a constant speed of 10m/s. A bob is suspended from the roof of carby a string of 1 m. The angle made by stringwith the vertical is?

A car can have no acceleration even if its moving A. true B. false

A weather balloon is inflated to a volume of 2.2 x 10^3 L with 374 g of helium. What is the density of helium in grams per liter?

What is the result of a mutation during replication A: the strands are different B: the strands are identical c: the strands are broken D: the strands are continuous

What is ___ heating of a liquid__ gas to liquid

A gate in an irrigation canal is constructed in the form of a trapezoid 2 m wide at the bottom, 38 m wide at the top, and 2 m high. It is placed vertically in the canal so that the water just covers the gate.

A machine with a mechanical advantage of 10 is used to produce an output force of 250 newtons. What input force is applied to this machine