A penny falls from a windowsill which is 25.0 m above the sidewalk. How much time does a passerby on the sidewalk below have to move out of the way before the penny hits the ground?

Which answer best describes thermal energy?

what is physical fitness? 1) the improvement of the body through inteninoal movement 2) the speed at which the body moves during exersize 3) the ability of the body to function of the body to function efficiently during exercise D) the preformence

Heat energy from the sun creates air currents called what?

What element x is most likely to react to form the compound xf5?

A quantum system has three energy levels, so three wavelengths appear in its emission spectrum. The shortest observed wavelength is 218 nm; light with a 454 nm wavelength is also observed. What is the third wavelength?

What's bigger 32A or 32B

Two charged objects have a repulsive force of. 080 N. if the charge of both of the objects is doubled, then what is the new force?

A hiker leaves her camp and walks 3.5 km in a direction of 55° south of west to the lake. after a short rest at the lake, she hikes 2.7 km in a direction of 16° east of south to the scenic overlook.

A star has a mass of 1.36 x 1030 kg and is moving in a circular orbit about the center of its galaxy. the radius of the orbit is 2.1 x 104 light-years (1 light-year = 9.5 x 1015 m), and the angular speed of the star is 1.1 x 10-15 rad/s.

Floating in deep space, you find yourself at rest next to a small asteroid. You reach out and tap the asteroid with a hammer. What happens to you in this process?