Natural forces that can alter ecosystems include seasons and climate changes.

T or F

A man pushes on a piano with mass 180 kg; it slides at constant velocity down a ramp that is inclined at 19.0° above the horizontal floor. Neglect any friction acting on the piano.

Two objects with different masses accelerate at the same rate according to newton's 2nd law, what must be true about the forces pushing objects?

Suppose a car battery has an internal resistance of 0.02 ohms. The voltage between terminals when no current is flowing is 13.6 volts. (The usual value of "12 volts" for lead-acid batteries is only nominal; the actual voltage is higher.

Select the statement that is true regarding scientific theories. A. Scientific theories are what laws are called before they are proven. B. Scientific theories attempt to explain why natural events occur. C.

Which of these stars has the coolest surface temperature? A. A starB. F starC. G starD. K star

Two railroad cars, each of mass 6500 kg and traveling 80 km/h in opposite directions, collide head-on and come to rest. how much thermal energy is produced in this collision?

What is a result of using a machine?

A boy rides motorbike with velocity of 20 m/s He accelerates his motorbike to a velocity of 30 m/s for 5 second. Calculate the acceleration produced in the motorbike. [Ams 2ms

How is a star's emission spectrum used to study stars?

A 52.0 kg skateboarder does a trick on a half-pipe. During the trick, he reaches a speed of 8.90 m/s. The radius of the half-pipe ramp is 3.00 meters. What is the minimum centripetal force necessary to keep the skater on the ramp?