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A speedboat starts from rest and accelerates at +2.01 m/s2 for 7.25 s. At the end of this time, the boat continues for an additional 5.85 s with an acceleration of +0.518 m/s2. Following this, the boat accelerates at -1.49 m/s2 for 8.00 s.
(a) What is the velocity of the boat at t = 21.1 s? _____m/s
(b) Find the total displacement of the boat. ______m
Two identical piano wires have a fundamental frequency of 491 Hz when kept under the same tension. when both wires oscillate simultaneously
A very large number (N+1) polaroids are arranged in a sandwich, The transmission axis of each polaroid is at a constant angle, with respect to its predecessor
A small box of mass 10 kg is placed on top of a large box with a mass 4 times that of the small box. find the magnitude of the frictional force acting on the small box
An athlete completed a marathon in 2 h, 39 min, 41 s. Determine the average speed (in miles per hour) of the athlete.
A 2{rm kg} box rests on a plank that is inclined at an angle of 65 ^circ above the horizontal. The upper end of the box is attached to a spring with a force constant of 390 N/m.
A car makes a round trip for 100m in 10 seconds. What is the average velocity?
A 22 child slides down a 2.4 -high playground slide. She starts from rest, and her speed at the bottom is 1.9 What is the change in thermal energy of the seat of her pants?
A jumper in the long-jump goes into the jump with a speed of 12 m/s at an angle of 20 deg. above the horizontal. How far does the jumper jump?
An electron with a speed of 7.98 × 108 cm/s in the positive direction of an x axis enters an electric field of magnitude 2.25 × 103 N/C, how much time will have elapsed
Does the force that your hand exerts on the bag's handle do any work? Define. Does this force do any work while you are riding up an escalator at a constant velocity.
assume a block of mass 25.0 kg rests on a horizontal plane, and the coefficient of static friction between the surfaces is 0.220. what is the actual static frictional force that acts on the block if an external force of 25.0 N acts horizontally on..
Mr. Physics drops a rock down a 250-meter deep well. Upon impact with the bottom of the well a short burst of sound is produced with a frequency of 250 Hz. How long after he drops the rock does he hear it hit bottom of the well.
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