If the lights are off in a room and there are no windows, why do most objects appear black?

The mass of a golf ball is 45.9 g. if it leaves the tee with a speed of 72.0 m/s, what is its corresponding wavelength?

An athlete has a mass of 62 kg and a volume of 65 liters. What is the density is kg/l?

Commander Shepard, an N7 spectre for Earth, weighs 799 N on the Earth's surface. When she lands on Noveria, a distant planet in our galaxy, she weighs 356 N. What is the acceleration of gravity on Noveria in m/s2? Round to one decimal place.

Is the distance a baseball travels in the air after being hit distance a baseball travels in the air after being hit a discrete random variable, a continuous random variable, or not a random variable?

All questions on heat especially on thermal dynamics

A bad case of the tonsillitis can sometimes affect a persons breathing how possible

How gravity affect time? With reference to einstein special theory of relativity

An experiment was performed on a 2-kg block. Forces of 5, 10 and 15 Newtons respectively were applied to the block for 5 seconds. Describe the difference in final speed between the three trials.

Jake designed an experiment to demonstrate a solar eclipse. The steps of the experiment are listed below. Place a light bulb on a stand. Stick a pencil into a small styrofoam ball. Switch on the light bulb and darken the room.

A boat sails an average speed of 20 km/h for 2 days. How far does the boat travel?