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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 highway is to be built between two towns, one of which lies 30.0 km south and 83.0 km west of the other. What is the shortest length of highway that can be built between the two towns, and at what angle would this highway be directed?
a projectile is fired with an initial speed of 64.8m/s at an angle of 44.3 degrees above th horizontal on a long flat firing range. determine the direction of the projectile
Find the lowest energy of the system (in electron volts) and list the quantum numbers of all occupied states. Find when the current in the solenoid increases to 5.0 A in a period of 0.90 s.
I am rising upward in a hot air balloon. I am holding my coffee container and i accidentally let go of it when I am leaning out and enjoying the view. Whats the greatst height the container achieved in its flight
A satellite is on a circular orbit of radius twice of that of Earth. If the Earth surface is considered to be a mirror, what is the speed of the image of the satellite
What is the approximate mass of an object whose weight equals the force in part (b).
A spaceship leaves Earth traveling at 0.65 c. A second spaceship leaves the first at a speed of 0.80 c with respect to the first. Calculate the speed of the second ship with respect to Earth if it is fired directly backward toward Earth
Three point charges -q,-q, and 2q occupy the verices of an equilateral triangleof side a. Find the electric field at the center of the triangle
A stainless-steel orthodontic wire is applied to a tooth that is out of line by 40 degrees. find the magnitude of the force on the tooth
You rub an inflated balloon on the carpet and it acquires a potential that is 1560 V lower than its potential before it became charged. what is the net charge on the balloon
A chair of mass 13.0kg is sitting on the horizontal floor; the floor is not frictionless, Use Newton's laws to calculate the normal force that the floor exerts on the chair
What is the maximum sideways angle. What is the train's acceleration after its wheel begins to stick.
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