The atomic number of magnesium is 12. Its nucleus must contain A) 6 protons and 6 neutrons. B) 6 neutrons and 6 electrons. C) 12 neutrons and no protons. D) 12 protons and no electrons.

A 70kg man is moving with a speed of 3.2 m/s on a rough surface, his speed was decreasing uniformly until he reaches to a stop because of the friction of the rough surface. Calculate the friction force exerted on the man.

What temperature should i set my curling iron to?

A rock climber throws a small first aid kit to another climber who is higher up the mountain. The initial velocity of the kit is 5.70 m/s at an angle of 45.7 ° above the horizontal.

You need to move your 2 kg physics book from the dinner table. You lift it to the shelf that is 3 m above the table. How much work was done?

A certain lightbulb has a tungsten filament with a resistance of 21.7 Ω when at 20.0°C and 146 Ω when hot. Assume the resistivity of tungsten varies linearly with temperature even over the large temperature range involved here.

What was significant about the atomic theory that democrituis proposed?

What is the mechanical advantage of a pulley?

What kind of movement does the heat within the core and mantle directly generate?

Explain why Newton's first law of motion can be difficult to observe in moving objects?

No force is necessary to