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A 0.065-kg tennis ball moving to the right with a speed of 15 m/s is struck by a tennis racket, causing it to move to the left with a speed of 15 m/s. If the ball remains in contact with the racquet for 0.020 s, what is the magnitude of the average force exerted on the ball?
A 0.144 kg baseball is pitched horizontally at +38 m/s and after it is hit by the bat it moves horizontally at -38 m/s.
When the centrifuge reaches an angular speed of 2.5 rad/s, the trainee experiences a total acceleration equal to 4.8 times the acceleration due to gravity. Explain how long is the arm of the centrifuge?
A football player runs the pattern by the three displacement vectors, , and . The magnitudes of these vectors are A = 4.00 m, B = 18.0 m, and C = 16.0 m. Using the component method, find out the (1) magnitude and (2) direction of the resultant vec..
think about the modes of substances in the gas phase and explain why potential energy is included in the thermal energy of some substances in the gas phase, when a monatomic solid/liquid turns into a gas, what are the PE and KE equal to then
Object A of mass 1 kg and velocity 10 m/s east collides with object B of mass 2 kg and veocity 8 m/s south. What is the velocity of object B after the collision
Water flows through a pipe with circular cross section. The fluid has a radius of 5.0 cm and flows at 2.0m/s. The output has a radius of 2.50 cm. find the output velocity.
Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1.5 mm. What is the resistance ratio RA/RB, measured between their ends
The far point of a nearsighted person is 5.0 m from her eyes, and she wears contacts that enable her to see distant objects clearly. How high is the image formed by the contacts
A sound wave from a siren has an intensity of 88.8 W/m2 at a certain point, What is the intensity level of the sound wave due to the ambulance
Two circular disks spaced 0.50 mm apart form a parallel-plate capacitor. Transferring 1.50 ×109electrons from one disk to the other causes the electric field strength to be 2.90 ×105N/C
A commuter train passes a passenger platform at a constant speed of 35.5 m/s, What wavelength is detected by a person on the platform as the train approaches
Point charges q1=+2.00?C and q2=?2.00?C are placed at adjacent corners of a square for which the length of each side is 4.50cm, What is the electric potential at point b
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