A 500g sample of Potassium-40 is left to decay radioactively. After 3.9 x 109 years, about how many grams of Potassium-40 are expected to remain? [The half-life of Potassium-40 is 1.3 x 109 years.]

A ball (mass 0.40 kg) is initially moving to the left at 30 m/s. After hitting the wall, the ball is moving to the right at 20 m/s. What is the impulse of the net force on the ball during its collision with the wall? A) 20 kg.

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How many significant figures do each of the following numbers have: (a) 214, (b) 81.60, (c) 7.03, (d) 0.03, (e) 0.0086, (f) 3236, and (g) 8700?

What happens when a force exerted on an object causes the object to move? O Work is done on the object. The object's energy is destroyed. O Potential energy is created. O Kinetic energy is created.

Which of the following is an example of speed? A truck driving 15 miles per hour south A cat running 5 meters per minute A bicyclist ridding 12 miles per hour east A plane traveling at 15 miles

A rock has a height of 4 cm, a length of 5 cm, and a width of 2 cm. what is the volume of the rock?

The filament of a certain lamp has a resistance that increases linearly with temperature. When a constant voltage is switched on, the initial current decreases until the filament reaches its steady-state temperature.

What is the mass number of the particle emitted from the nucleus during beta minus decay? What kind of charge does the particle emitted from the nucleus during beta minus decay have?

Explain what happens to each ball after the collision. Why do you think this occurs? Which of Newton's laws does this represent?

A wave has a wavelength of 8 mm and a frequency of 11 hertz. What is its speed? Your Answer:?