If a system requires 150 j of input work and produces 123 J of output work, whats its effiency

Dina has a mass of 50 kilograms and is waiting at the top of a ski slope that's 5.0 meters high.

In a Millikan oil-drop experiment, the charges on several different oil drops were as follows: - 5.92; - 4.44; - 2.96; - 8.88. The units are arbitrary.

Two polarizers are held in front of a light source such that their transmission axes are parallel. As the angle between the two transmission axes increases toward 90°, which of the following is true? A.

When does an object possess mechanical energy? can be more than one when it has the potential to move when it is moving when it is stationary when it is fixed to a specific location

What is brass, salt, water an example of

The probability that a battery will last 10 hr or more is 0.8, and the probability that it will last 15 hr or more is 0.11. Given that a battery has lasted 10 hr, find the probability that it will last 15 hr or more

What is the sum of 9260 and 3240? Express your answer numerically to at least three significant figures.

What could you do if the plant is placed in your community and later leads to pollution beyond the amounts allowed by the EPA?

The friends now feel ready to try a problem. Suppose an Atwood machine has a mass of m1 = 2.5 kg and another mass of m2 = 8.5 kg hanging on opposite sides of the pulley. Assume the pulley is massless and frictionless, and the cord is ideal.

What are the 3 main branches of natural sciences