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Questions and answers by
Kareem
Questions (9)
The half-life of carbon-14 is 5730 years. How much of a 50 g sample of carbon-14 is present after 11,460 years?
1 answer
628 views
Suppose that you balance a 5 kg ball on the tip of your finger that has an area of 1 cm2. What is the pressure
on your finger?
1 answer
804 views
A rectangular barge floats in freshwater. When a 400 kg block is loaded on the 5 m long by 2 m wide barge,
the barge sinks a few
0 answers
887 views
A box of mass 10 kg is pushed across the floor with a force of 25 N. A 2 N frictional force opposes the motion.
What is the
1 answer
685 views
A ball is thrown at 22 m/s at 45 degrees to the horizontal. A 5 foot tall fence is located 100 meters away. Does
the ball make it
1 answer
503 views
A rock thrown horizontally from a bridge hits the water below 30 meters away in the horizontal direction. If
the rock was in the
1 answer
729 views
Calculate the force of gravity between Earth (mass = 6.0 * 1024 kg ) and the moon (mass = 7.4 * 1022 kg) the average earth-moon
1 answer
1,131 views
A 70 kg person is riding on a frictionless skateboard at 5 m/s. A friend facing him throws a 5 kg ball toward him at 20 m/s.
1 answer
490 views
A line parallel to one side of a triangle divides one of the other sides into segments of lengths 15 and 9 and divides the third
1 answer
601 views
Answers (2)
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thank you for all of your help
