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A 50 kg person climbing a rope slides down after reaching the top. The acceleration of the person downward is 2m/s^2. The frictional force acting upward on the person is?
You have a thin lens with a focal point at 1.7 cm. If you place a candle stick at a distance of 3.9 cm from the center of the lens, calculate the distance of the resulting image from the lens
Two loudspeakers in a 20°C room emit 629 Hz sound waves along the x-axis, If the speakers are out of phase, what is the smallest distance between the speakers for which the interference of the sound waves is constructive
what is the max number of steps any worker should be allowed.
An unmarked police car travelling a constant 85 km/h is passed by a speeder. Precisely 2 s after the speeder passes, police officer steps on the accelerator.
Jupiter is 23.10 m/s2. What is the ratio of your speed on Jupiter to your speed on Earth when you have dropped 45.0 m? Overlook the effects of air resistance and suppose that you start at rest.
How much does it cost to cook food in a 12,000 W oven for 47.6 minutes? Assume electricity costs 8.0 cents per kW·h
A 2.0 kg ball swings in a vertical circle on the end of an 80cm long string. Calculate the speed, magnitude and direction of acceleration
A uniform solid disk of mass m = 3.05 kg and radius r = 0.200 m rotates about a fixed axis perpendicular to its face with angular frequency 5.97 rad/s. Calculate the magnitude of the angular momentum of the disk
Illustration on Eratosthenes' process
A dc motor has coils with a resistance of 13 ? and is connected to an emf of 120.0 V. When the motor operates at full speed, the back emf is 72 V. What is the current when the motor is at full speed
A block of ice at 0 degrees C, whose mass is initially 30.0 kg, slides along a horizontal surface, starting at a speed of 5.56 m/s and finally coming to rest after travelling 21.8 m. figure out the mass of ice melted (in grams) as a result of frictio..
illustrate what is the magnitude of the acceleration of the box and hanging mass?
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