What is the efficiency of a machine that miraculously converts all the input energy to useful output energy?

What is the effect of changing the wire in a circuit from a straight thick wire to a straight thin wire? A. the bulbs become brighter B. the bulbs stay at the same level of brightness C. the bulbs become dimmer

Warm air aloft is normally higher pressure relative to colder air aloft, which is normally of lower pressure (at equivalent altitudes). (hint: think of columns of cold and warmer air standing side-by-side) a. Trueb. False

Occurs when an object's velocity decreases

A 66-kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.2 m/s in 0.90 s. The elevator travels with this constant speed for 5.0 s, undergoes a uniform negative acceleration for 1.

Describe the relationship between the direction of the velocity vector and the direction of the acceleration for a body moving in a circle at constant speed.

If a pressure gauge measure an increase in 3*10^ (5) Pa on an area of 0.7 m^2, calculate the increase in the force applied to the area?

Which of the following is an example of potential rather than kinetic energy? a. water rushing over Niagara Falls b. a molecule of glucose c. a crawling beetle foraging for food d. light flashes emitted by a firefly

If a force of 15 newtons [N] is applied to a surface and the pressure is measured as 4,000 pascals [Pa], what is the area of the surface in units of square milimeters [mm2 ]?

An engineer has the task of producing an aluminum alloy with a density of 3.0 grams per cubic centimeter. She comes up with the perfect alloy and saves a sample of it. Which mass and volume measurements correspond to this sample? 7 g and 2.

What must be your car's average speed in order to travel 235km in 3.25 hours?