If John runs 3 km s, 2 km n, 1 km e, what is the distance and displacement

What is the main difference between a refracting telescope and a reflecting telescope

A woman is pushing a 38.7kg lawnmower initially at rest with a 68.7N forward force against friction. The lawnmower speeds up to 1.44m/s in 3.81s. How much force does friction evert on the mower

There are pluses and minuses to being a competitive person. True False

Consider a Young's two-slit experiment in which the wavelength of light is 37% smaller than the distance between the slits.

A group of hikers hear an echo 3.3 s after they shout. The temperature is 20◦C. How far away is the mountain that reflected the sound wave? At this altitude, the speed of sound in air at 273 K is 327 m/s. Answer in units of m.

An alloy is made of a material of specific gravity 7.87 and another material of specific gravity 4.50. The alloy of mass 750g has an apparent weight of 6.6N when totally immersed in a liquid of specific gravity 0.78.

A ball with a mass of 3 kg moving at 5 m/s collides with a 9 kg ball at rest. After the collision, the impacting (3 kg) ball bounces back at a speed of 2.5 m/s. How fast does the 9 kg ball move and in what direction

Consider the four salts represented on the solubility curves displayed as line graphs. In all four cases the salts are which part of an aqueous solution?

A hot-air balloon of diameter 12 m rises vertically at a constant speed of 11 m/s. A passenger accidentally drops his camera from the railing of the basket when it is 19 m above the ground.

Describe the possible long term impact of a catastrophic event