A Gardener pulls a 50 kg roller along level ground, as shown in the picture. The handle of the roller makes a 30°
angle to the horizontal ground, and the gardener pulls with a
force of 300 N along the handle.
What is the horizontal component of the 300 N force?

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.