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Questions in physics

[Homework Help] A machine with a mechanical advantage of 10 is used to produce an output force of 250 newtons. What input force is applied to this machine?

[Homework Help] A horse moves a sleigh 1.00 kilometers by applying a horizontal force of 2000 Newtons on its harness for 45 minutes. What is the power of the horse?

[Homework Help] The excitation of an electron on the surface of a photocell required [tex]5.0 \times 10^{-27} \text{ J}[/tex] of energy. Calculate the wavelength of light that was needed to excite the electron in an atom on the photocell.

[Homework Help] A bird flies 2.8 units due west and then 2.7 units due north. Another bird flies 2.7 units due west and 2.8 units due north. What is the angle between the net displacement vectors for the two birds?

[Homework Help] Find the value of 15.0 Newtons in pounds.

[Homework Help] What do all members of a biological species have in common? A. They can interbreed and produce fertile offspring. B. They are members of the same population. C. They have identical physical characteristics. D. They live in the same geographical location.

[Homework Help] The acceleration of gravity on the Moon is equal to one-sixth of Earth's gravitational acceleration. If an astronaut has a mass of 60 kg, what is the mass and weight of the astronaut on the Moon?

[Homework Help] What do tire treads, rubber mats, automobile brakes, and tennis shoes have in common? A. They reduce friction. B. They are lubricants. C. They increase friction. D. They reduce static electricity.

[Homework Help] What is the velocity of a particle?

[Homework Help] What is the speed of a particle?