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A baseball bat has 120 J of kinetic energy as it hits a baseball (m = 0.145 kg).
(a) If the baseball bat transfers 70 J of its kinetic energy to the baseball, what is the efficiency of the energy transformation?
(b) Find the speed of the baseball immediately after it has been hit.
You have to do 2100Joule of work to push a 90 kilogram crate 2.5 meter up along a slope inclined at 20o. Find the coefficient of static friction between slope and crate
John who is ice skating eastward collides with Mary who is ice skating northward. What was John's initial speed
A soccer player kicks the ball from ground level with an initial velocity of 21 m/s at 35 degrees above horizontal. What is the direction of the ball's velocity when it reaches the goal 30m (horizontal) away
A group of particles is traveling in a magnetic field of unknown magnitude and direction. You observe that a proton moving at 1.20 km/s in the + x-direction experiences a force of 2.10×10-16 N in the + y-direction, What is the magnitude of the mag..
the position of a particle moving along the x axis is given in centimeters by x 9.13 1.33 t3 where t is in seconds.
A man holds a double-sided spherical mirror so that he is looking directly into its convex surface, 35 cm from his face. The magnification of the image of his face is +0.13. What will be the image distance when he reverses the mirror (looking into..
A painter is standing on scaffolding that is raised at constant speed. As he travels upward, he accidentally nudges a paint can off the scaffolding and it falls a distance 15.4m to the ground. find the speed of the can just before it hits the groun..
A rocket is launched from a 350 m high cliff at an angle of 25? with an initial velocity of 50 m/s. The rocket engine produces a constant horizontal acceleration of 5 m/s2. (g=9.8m/s2). Begin by drawing a diagram and determine:
A diffraction pattern forms when light passes during a single slit. The wavelength of the light is 675 nm.
Compare and contrast natural versus anthropogenic climate changes. Include at least two (2) specific examples of each.
Suppose you carry a bag of groceries weighing 100 N from your car to your kitchen, a distance of 61 m, without raising or lowering the bag. What is the work done by the force you exert on the bag
A 1 mF, a 2 mF, and a 3 mF capacitor are connected in parallel, the combination being connected across a 9 volt battery. Which capacitor has the greatest voltage
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