Two plane mirrors are inclined at an angle of 70. For a ray of light, incident on mirror 1, its angle of reflection from mirror 2 is

A balloonist drops an apple weighing 1.5N over the side of the balloon's gondola. As it falls and increases speed, the drag force from the air upward on it increases. When the upward force is 0.

Which of the following explains how heat flow within Earth changes its surface? Molten material moves in one direction, moving the plates in the opposite direction Molten material moves in one direction, moving the plates in the same direction

You collect hydrogen gas over water at 323 K. The partial pressure of hydrogen is 122.4, and the total pressure is 134.7 kPa. What is the pressure of the water vapor

Which of the following measurements is a deceleration? a. 0 km/h2 b. 1.7 m/s2 c. - 8.0 m/s d. - 5.6 km/s2

Why ice floats on water?

A car rounds a 75-m radius curve at a constant speed of 18 m/s. a ball is suspended by a string from the ceiling the car and moves with the car. the angle between the string and the vertical is:

A wave has a wavelength of 7 mm and a frequency of 9 hertz. What is its speed?

Which statement best describes the effect of scientific advances on society? A. They always have a positive impact on society. B. They are inspired by the needs of society. C. they do not affect society beyond the community level. D.

Which is the best example of reusing? repairing a stove instead of buying a new one wearing a pair of pants made from cotton buying a toy packaged in paper instead of plastic placing a glass bottle in the recycling bin

The sunlight hits the surface of a lake this will like caused a. condensation b. transpiration c. evaporation d. sublimation