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A discus thrower (with arm length of 1.2 m) starts from rest and begins to rotate counterclockwise with an angular acceleration of 1.8 rad/s2. (a) How long does it take the discus thrower's speed to get to 3.5 rad/s? (b) How many revolutions does the thrower make to reach the speed of 3.5 rad/s? revolutions (c) What is the linear speed of the discus at 3.5 rad/s? (d) What is the tangential acceleration of the discus thrower at this point? (e) What is the magnitude of the centripetal acceleration of the discus thrown? (f) What is the magnitude of the discus's total acceleration?
Spaceship A and spaceship B are racing toward an airless moon at speeds of 0.15c and 0.85c, respectively. What is the speed of the pulse received from spaceship A
A Carnot engine is operated between two heat reservoirs at temperatures of 300K and 400K.
A circuit has a 12 V source connected to a 5 Ohm resistor and 7 Ohm resistor in series. A current of 1 A flow through them. What is the power dissipated across the small resistor
A 107A A current circulates around a 2.20-mm-diameter superconducting ring. What is the ring's magnetic dipole moment
a boy hears an eco of his own voice from a distant hill after 1s. The speed of the sound is 340m/s. What is the distance of the hill from the boy
A 16.0-? resistor, a 12.0-µF capacitor, and a 17.0-mH inductor are connected in series with a 155-V generator. At what frequency is the current a maximum
On a hot summer afternoon, Keith is out fishing in a rowboat when he decides to jump into the water and go for a swim, what is its velocity in the opposite direction after he jumps
The speed of a 1kg object is 2.0m/s (+/-) .05m/s, meaning its absolute uncertainty is .5m/s, calculate the absolute uncertainty in the kinetic energy
A train is traveling at 30m/s relative to the ground in still air. What frequency, (f.approach), is heard by a passenger on a train moving at a speed of 18m/s relative to the ground
1ml of distilled water is injected into a length of 3mm diametre tubing and sealed at the other end by folding over, Why doesn't water drain out when the tube is hung vertically
A 200 g ball on a 55-cm-long string is swung in a vertical circle about a point 200 cm above the floor. What was the tension in the string an instant
A uniform beam of length L = 8.00 m and weight 5.35x10^2 N is carried by two workers, Determine the force that each person exerts on the beam
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