You and two friends apply a force of 425 N to push a piano up a 2.0 m long ramp. If lifting the piano straight up requires 1700 N of force, what is the mechanical advantage of the ramp?

Anya recorded the temperatures of four different smooth materials after they were placed under a heat lamp for thirty minutes. Which conclusion is best supported by the information in the chart?

How does someone express love to another person that likes the person but is not sure if the other if they like you back?

Why is inertia important in the laws of motion?

Which condition results when cells receive three copies of chromosome 21

In an inverse relationship, when one variable increases, the other blank

An example of a stable system

What causes chemical weathering? a. damage caused by animals and plants c. natural acids b. ice wedging d. physical factors

1. Strzała o masie 20 g tuż po wystrzale ma prędkość 50 m/s. Oblicz pracę wykonaną przez zawodniczkę. Ile wynosi energia potencjalna sprężystości napiętej cięciwy? 2. Na trampolinę o współczynniku sprężystości k=2 kN/m stanął zawodnik o masie 80 kg.

Two small plastic spheres between them has magnitude 0.22 N. What is the charge on each sphere is one the other? Explain whether it can be determined from the information give, whether the charges are positive or negative.

If it has enough kinetic energy, a moleculeat the surface of the Earth can escape the Earth's gravitation. The acceleration of gravity is 9.8 m/s2, and the Boltzmanns' constant is 1.38066*10-23 J/K.