The polar ice caps of mars is believed to consist mostly of

Rock formed from the crystallization of magma is called

A train travels 90 kilometers in 1 hours, and then 60 kilometers in 3 hours. What is its average speed

The force of attraction between two objects, which is related to the object's mass is the definition of

A 900 kg car accelerates 2 m/s2 to the right. What is the net force acting on the car? 1800 N to the left 450 N to the right 450 N to the left 1800 N to the right

A steam turbine operates with 1.6 MPa and 350°C steam at its inlet and saturated vapor at 30°C at its exit. The mass flow rate of the steam is 22 kg/s, and the turbine produces 12,350 kW of power.

If a string completes 500 vibrations in one second, what is its frequency?

An electric generator moves a magnet near a coil of wire to produce an electric current. describe the energy transformation in an electric generator. a. it transforms kinetic energy into electrical energy. b.

Find the wavelength of a 26 Hz sound wave traveling through air at 20ºC. Hint: speed of sound at 20ºC = 343 m/s

A rock is dropped from a cliff. What will eventually happen to the rock's motion? A. Gravity will cause the rock to slow down before it reaches Earth. B. Air resistance will cause the rock to accelerate as it falls. C.

Sunspots. Which of the following is a true statement.