If a sample that is 4860 years old has 50 radium atoms remaining, how many atoms were in the original sample?

When the speed of an object changes, what happens to its velocity?

Suppose you are holding a basketball while standing still on a skateboard. You and the skateboard have a mass of 50kg. You throw the basketball with a force of 10N. What is your acceleration before and after you throw the ball?

Wave 1 carries more energy than Wave 2. Wave 3 carries more energy than Wave 2. Keeping speed constant, the greatest amount of energy is carried by a wave with

When two people swing a jump rope, they can make it swing as a single arc or as two half-ropes arcing in opposite directions?

A ufo was detected on the radar flying 7400 miles in 3 min, what is the estimated speed per hour?

Two books with different masses fall off the same bookshelf. As they fall, which has more kinetic energy and why

Which of the following is an example of convection? a a hot object transferring heat to a cooler one b the rays of the Sun warming the earth c a hot oven warming the air around it d hot air rising and cooler air falling

Bob drove from home to work at 60 mph. after work the traffic was? heavier, and he drove home at 50 mph. his driving time to and from work was 1 hour and 28 minutes. how far does he live from his? job?

How to measure voltage across an ungrounded component with a two channel oscilloscope?

In deep space there is very little friction once they are launched into a probe into deep space where there are no external forces acting on it scientists shut the probe's engines off because the scientists want the probe to