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A pitcher pitches a baseball of mass 0.20 kg. The baseball arrives at home plate with a speed of 40 m/s and is batted directly back to the pitcher (horizontally) with a return speed of 50 m/s.
a. What is the magnitude of the change of momentum of the baseball?
b. If the bat remains in contact with the ball for 0.12 s, what is the magnitude of the average force of the bat on the ball?
c. If instead of going directly back to the pitcher (horizontally), the ball comes off the bat at an angle of 30o above the horizontal with a speed of 50 m/s, what is the magnitude of the average force of the bat on the ball?
A person scuffing her feet on a wool rug on a dry day accumulates a net charge of -95?C. By how much does her mass increase
the data represents the resistance R of a thermistor in Ohms as a function of tempeature T in kelvin make a graph of the natural logarithm of the resistance ln(R) versus the inverse of the temperature, 1/T and determine the constants Ro and B in R..
A balloon is released from a tall building. The total mass of the balloon including the enclosed gas is 1.5kg. Its volume is 2.5m^3. What is the average density of the balloon with gas
A woman once survived a fall of over six miles without a parachute when her plane exploded. What is this distance in meters
Two tug boats are towing a ship. Each exerts a horizontal force of 5 tons and the angle between their towropes is 90 degrees. What net force is exerted on the ship?
Four charges, Aq, Bq, Cq, and Dq (where q = 2.25 ×10?7 C), sit in a plane at the corners of a square whose sides have length d = 82.5 cm. A charge, Eq, is placed at the origin at the center of the square.
Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 5.00 m. What is the frequency of the sound
An 800kHz radio signal is detected at a point 6.6 kmdistant from a transmitter tower. The electric field amplitude of the signal at that point is 780mV/m. What is the magnetic field amplitude of the signal at that point
Driving in your car with a constant speed of 13 m/s, you encounter a bump in the road that has a circular cross section, as indicated in the figure. If the radius of curvature of the bump is r = 29 m, find the apparent weight of a 59-kg person in you..
An object is placed 9.30 cm in front of the cornea. he image formed by the cornea serves as an object for the lens. Treat the lens as a thin lens 7 mm behind the cornea. Find the optical power of the lens necessary to form an image on the retina
From what height will you have to drop the rock on Earth so that the fall-time on both planets is the same.
an electric power line carries a current of 1400 a in a location where the earths magnetic field is 6.0 ? 10-5 t. the
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