What are two ways that machines make work easier?

The battery charger for an mp3 player contains a step-down transformer with a turns ratio of 1:24, so that the voltage of 120 v available at a wall socket can be used to charge the battery pack or operate the player.

The precision of a laboratory instrument is ± 0.05 g. The accepted value for your measurement is 7.92 g. Which measurements are in the accepted range? Check all that apply. 7.85 g 7.89 g 7.91 g 7.97 g 7.99 g

Which statement is true about a polarized object?

The filter reaches therminal velocity with zero paper clips (T or F)

Which of the following is the tendency for a material to oppose the flow of electrons and change electrical energy into thermal energy? A. resistance B. volts C. Ohms D> electric current

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. The athlete is able to rotate the ball at the rate of 8.44 rev/s when the length of the chain is 0.600 m. When he increases the length to 0.

A moving small car has a head-on collision with a large stationary truck 7.3 times the mass of the car. Which statement is true about the direction of the car after the collision if the collision is elastic?

In a ballistic pendulum experiment, projectile 1 results in a maximum height h of the pendulum equal to 2.0 cm. A second projectile causes the the pendulum to swing higher, to h2 = 5.5 cm.

Uncharged Particle A. Neutrons B. Protons C. Electrons D. Molecule

What fuel (s) are the main energy source during short, intense bursts of exercise? Metabolism of protein only Metabolism of fat only Metabolism of carbohydrate only Carbohydrates and vitamins Caffeine Medium-chain triglycerides Erythropoietin