A weightlifter lifts a 250-kg mass 0.5 meters above his head, how much PEg does the mass have (Note: g=9.8 m/s2) ?

When the rear end of your vehicle slides back and forth this is known as?

A rock is thrown off a cliff at an angle of 57° above the horizontal. the cliff is 135 m high. the initial speed of the rock is 24 m/s. (assume the height of the thrower is negligible.

An electron travels 1.64 m in 4.32 * 10-8 s. How fast is it traveling? Answer in units of m/s

What light is NOT in the visible light spectrum

Which of these describe the composition of earths atmosphere? A) mixture B) substance C) compound

Which of the following is the best example of a proper hypothesis? Water will flow faster through tightly packed soil than through loosely packed soil. I think there is no effect on hearing if you listen to loud music for only three hours a day.

If an electrically neutral atom has 4 protons and 4 neutrons and it gains 2 neutrons what is its electrical charge

Which of these types of organisms is there more of on Earth? A. goat B. human C. dandelion D. bacterium

Light traveling through the air strikes the surface of the four materials below. Which material reflects light but does not refract it? A) Diamond B) Water Droplets C) Prism D) Metal Spoon

A yoyo is hanging motionless from a string. Identify and describe the forces exerted on the string.