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A 73kg human sprinter can accelerate from rest to 12m/s in 3.2s . During the same interval, a 31kggreyhound can accelerate from rest to 19m/s. Compute
(a) the change in kinetic energy and
(b) the average power output for each.
A force of 20 N holds an ideal spring with a 1-N/m spring constant in compression. The potential energy stored in the spring is
When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell.
A luggage conveyor belt is inclined at at an angle 15.6 degrees and has length 350m. Estimate the power required to operate the luggage conveyor
A concave mirror produces a virtual image that is three times as tall as the object. what is the radius of curvature of this mirror
The half-life of iodine-131, an isotope used in the treatment of thyroid disorders, is 8.04 days. what is the activity of the sample
During the spin-dry cycle of a washing machine, the motor speeds up from 30 rad/s to 95 rad/s, What is the magnitude of the angular acceleration of the motor
A top is a toy that is made to spin on its pointed end by pulling on a string wrapped around the body of the top. What is the final angular velocity of the top when the string is completely unwound
A meter stick supported at the 50 cm mark has masses of 300 g & 200 g hanging from it at the 10-cm & 60-cm mark, respectively. Where should we hang a third, 400-g mass to keep the meter stick balanced?
A 1.7 -V. dry cell can be tested by connecting it to a low-resistance ammeter; it should be able to supply at least 30 A. What is the internal resistance (in ohms) of the cell in this case
A tortoise can run with a speed of 0.14 m/s, and a hare can run 20 times as fast. What is the length of the race in meters
After a plant or animal dies, its 14C content decreases with a half-life of 5730 years. what is the age of the ancient site
Suppose a molecular motor consumes 3 ATP molecules in every step. If this motor has a step size of 5.8 nm, what is the maximum force the motor could exert
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