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7.3-kg box is being lifted by means of a light rope that is threaded through a single, light, frictionless pulley that is attached to the ceiling.
a) If the box is being lifted at a constant speed of 2.0 m/s, what is the power delivered by the person pulling on the rope?b) If the box is lifted, at constant acceleration, from rest on the floor to a height of 1.5 m above the floor in 0.42 s, what average power is delivered by the person pulling on the rope?
An electric-generator turbine spins at 3400 rpm. Frictionis so small that it takes the turbine 19.0 min to coast toa stop. How many revolutions does it make while stopping
An electron moves in a circular path perpendicular to the constant magnetic field with a magnitude of 2.00 mT. The angular momentum of the electron about the center of the circle is 5.50 multiplied by 10-25 J•s.
Which is larger for a uniform disk of mass M and radius R that is rolling without slipping: its translational or its rotational kinetic energy? A. It's translational kinetic energy B. It's rotational kinetic energy C. Both are the same D. Question ca..
A plot of the displacement on the y axis vs. applied force on thte x axis for an ideal elastic spring. What would the slope of the curve be
A sphere of aluminum 11.3 cm in diameter is suspended in oil (density = 1 grams/cm3). Find the tension in the supporting string in Newtons
A ball of mass 0.196 kg with a velocity of 1.41 m/s meets a ball of mass 0.302 kg with a velocity of -0.393 m/s in a head-on, elastic collision. (a) Find their velocities after the collision. 1f = m/s 2f = m/s (b) Find the velocity of their center of..
A tennis ball with a speed of 13.20 m/s is moving perpendicular to a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 10.36m/s.
A 5.00-kW motor is used to pull a 20.0-kg crate up a 15.0°-incline of length 4.00 m. At what average velocity can the motor move the crate up the incline
q1. two point charges q1 -6.7 mu c and q2 3.0 mu c are located between two oppositely charged parallel plates. the
A 2.40 MHz sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as the heart beats.
The 2.0 kg, 20 cm diameter disk is spinning at 320 rpm. How much friction force must the brake apply to the rim to bring the disk to a halt in 2.0 s.
Another laser amplifier gives an output of 5I0 when it receives input intensity I0 tuned to w0, the centre frequency of the laser transition. When the input radiation istuned to nearby angular frequency w1
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