Is drag a contact or non contact force

The volume of 40g of a solid is 15cm3. will it float or sink in water/why?

What is a speed and motion?

What three ways does the respiratory system modify air before it reaches the lungs?

How does our interpretation of a distant galaxies red shift differ if we think of it as a cosmological redshift rather than as a Doppler shift

A force of 125n is applied to a 50kg. Mass what is the assceleration of the mass

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.