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A 60.5 -kg runner has a speed of 4.60 m/s at one instant during a long-distance event.
(a) what is the runner's kinetic energy at this instant?
KEi=________J
(b) if he doubles his speed to reach the finish line, by what factor does his kinetic energy change?
KEf/KEi=_____
A skier is gliding along at 3.6 m/s on horizontal, frictionless snow. He suddenly starts down a 10 degree incline. His speed at the bottom is 17 m/s .
The speed of sound in air at room temperature is 340 m/s. What is the frequency of a sound wave in air with wavelength 1.3 m
The Hale Telescope The 200-inch-diameter concave mirror of the Hale telescope on Mount Palomar has a focal length of 16.9, What is the magnification of her image
If 100,000 MHz radar waves are incident on a plane coated with a polymer whose index of refraction is n = 1.50, how thick would you make the coating
estimate the speed of the car just before braking. how much time passes before the brick lands on the ground..
A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 16.0° below the horizontal. The length of time the car is in the air
An airplane whose air speed is 608 is supposed to fly in a straight path 38 north of east. But a steady 86 wind is blowing from the north. In what direction must the plane head.
At what angle of incidence will green light (g = 560 nm) be most strongly reflected? Imagine the film has the minimum thickness that can produce these reflections.
An experiment measures the temperature of a 270 substance while steadily supplying heat to it. The results of the experiment show. What are (a) specific heat of the liquid phase and (b) the heat of vaporization.
How many 65W light bulbs can be connected in parallel across a potential difference of 85 V before the total current in the circuit exceeds 2.10A.
A bicycle wheel is rotating at 40rpm when the cyclist begins to pedal harder, giving the wheel a constant angular acceleration of 0.45rad/s2, What is the wheel's angular velocity, in rpm, 10s later
A stone is dropped from the top of the cliff. The splash it makes when striking the water below is heard 3.5 seconds after it is dropped. How high is the cliff? Presume that the speed of sound in air is 343 m/s and g = 9.8 m/s2.
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