It takes 300 N to move a box 10 meters in 10 seconds. How much power is

required?

O A. 100 W

O B. 3,000 J

C. 30,000 W

O D. 300 W

A bar magnet cut in half will form a total of poles. a) four b) eight c) two

Most stars are a. brown fs b. main sequence c. white dwarfs d. pulsars

A car accelerates from rest to a velocity of 5 meters/second in 4 seconds. What is its average acceleration over this period of time?

How do you find the net force acting on an object? a) find the largest force on the object b) add all the force vectors c) find the reaction force d) assume there is no friction

Now assume that the mass of object 1 is 2m, while the mass of object 2 remains m. If the collision is elastic, what are the final velocities v1 and v2 of objects 1 and 2?

A meteorologist wants to measure the temperature. Which weather instrument should the meteorologist use? a. a barometer b. a rain gauge c. a thermometer d. a weather vane

Calculate the mass defect of the helium nucleus 42He. The mass of neutral 42He is given by MHe=4.002603u.

A person lifts a 4.5 kg cement block a vertical distance of 1.2 m and then carries the block horizontal - ly a distance of 7.3 m. determine the work done by the person and by the force of gravity in this process.

A tree is standing in the middle of a meadow. As you watch, the wind begins to blow and the tree bends. Which statement best explains how you could tell that a net force was acting on the tree? OA) The tree had momentum.

A 5.1 kg black bear cub weighs 49.98 N. The cub is carried by its mother up into the safety of a white pine tree.