A pulley system is used to lift a crate weighing 150 newtons straight up. If the force applied is 87 newtons and the ideal mechanical advantage of the pulley system is 2, what is the percentage efficiency of the pulley system?

What happens to the volume of gas when the temperature drops? Also What happens to the volume of gas when the temperature rises?

Light with a wavelength of about 510 nm is made to pass through a diffraction grating. The angle formed between the path of the incident light and the diffracted light is 12.0° and forms a first-order bright band.

A shampoo advertized in your favorite magazine claims to have a secret ingredient that will make your hair thicker and shinier how could you test the claim?

What kind of chemical bond is formed when electrons are transferred from atom to atom

Which constellation is marked by a W or M? a. Cassiopeia b. Draco c. Ursa Minor d. Ursa Major

How would it be possible for an object to be traveling with a constant speed and still accelerating?

If a magnet is put inside one coil of wire a voltage is produced. What will happen if the magnet is put inside two coils of wire

An electric force exists between which pair of objects? Check all that apply. A) a neutral object and a negative object two negative objects B) a neutral object and a positive object C) two positive objects D) a negative object and a positive object

The Hubble Space Telescope (HST) orbits 569,000m above Earth's surface. Given that Earth's mass is 5.97 * 10^24 kg and its radius is 6.38 * 10^6 m, what is HST's tangential speed?

What do safety features in a car do to protect us in a collision