A 40.0 kg ballet dancer stands on her toes during a performance with 25.0 cm2 in contact with the floor. What is the pressure exerted by the floor over the area of contact if the dancer is stationary

In which of the following eons did the greatest variety of living things exist on earth? a) hadean b) archean c) proterozoic

From the deepest to the surface what are the parts of the earth's interior

What is true of transverse waves? a. Surface waves are transverse waves only. c. An example of transverse waves is sound waves. b. Transverse waves vibrate parallel to the direction d. Transverse waves travel through a medium. of the wave's motion.

Which example has gravitational potential energy? A. A horse slowing down from a run B. An apple about to fall from a tree branch C. A bicycle being pedaled down a horizontal path D. Beaker sitting on the floor

Is the visible light color spectrum a small segment of the electromagnetic spectrum?

Why is it that a football does not stay in motion at a constant speed when thrown, as the First Law of Motion suggests that it would? 1) Air resistance and acceleration 2) Gravity and mass 3) Distance, mass and gravity 4) Air resistance and gravity

A student pulls a box across a horizontal floor at a constant speed of 4.0 meters per second by exerting a constant horizontal force of 45 newtons. approximately how much work does the student do against friction in moving the box 5.

The percentage of water vapor in the air compared to the maximum amount of water vapor that air can contain at a particular temperature.

A piano emits frequencies that range from a low of about 28 hertz to a high of about 4200 hz. find the range of wavelength in air attained by this instrument when the speed of sound in air in 342m / s

Which statement is true about a polarized object? A) It gains electrons and becomes negatively charged. B) It gains protons and becomes positively charged. C) The number of positive and negative charges can be the same. D) It has to be a metal.