True or false?

Often what one expects to see influences what is perceived in the surrounding environment.

Suppose you have two meter sticks, one made of steel and one made of invar (an alloy of iron and nickel), which are the same length (1.00 m) at 0°C. The coefficients of volume expansion for steel and invar are 3.6 * 10-5 / °C and 2.

The efficiency of a ramp is 75%. if the amount of work input is 240 j, what is the amount of useful work output?

Which of the following correctly lists the planets in the Solar System from the smallest to the largest in terms of diameter? A. Mars, Mercury, Venus, Neptune, Uranus, Saturn, Jupiter, Earth B.

A force is exerted on the tires of a car to accelerate the car along the road

A 4400 W motor is used to do work. If the motor is used for 200 s, how much work could it do? (Power: P = W/t) 22 J 4200 J 4600 J 880,000 J

Why does sound travel faster under water?

Give one example when it might be important to know how much gravitational potential energy is stored by an object. Why is it important?

How much greater is the resistivity of lead to copper? 12 times 1.2 times 0.80 times 0.080 times

Two boxes hang from a solid disk pulley that is free to rotate as the blocks rise/fall. The left box has a mass m1 = 4.3 kg and the right box has a mass m2 = 2.1 kg. The pulley has mass m3 = 2.5 kg and radius R = 0.15 m.

What is the relationship between speed and instantaneous velocity? a) Speed is the magnitude of velocity b) Speed is the direction of velocity c) There is no relationship