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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?
A soldier has a huge contraption that notches a large 4 kg arrow (it looks more like a lance) in a massive bow and uses a winch system to draw the arrow back to set the bow. What is the speed of the arrow
A step-down transformer is used for recharging the batteries of portable devices. The turns ratio N2/N1 for a particular transformer used in a CD player is 7:72. find rms output voltage of the transformer
A 2.80 \mu F capacitor is charged to 460 V and a3.75 \mu F capacitor is charged to 525 V. These capacitors are then disconnected from their batteries, andthe positive plates are now connected to each other and thenegative plates are connected to e..
A plane surface with area 1.5 m2 is placed in a uniform magnetic field of 6.0 T that is oriented at an angle of 20 degrees to the surface. What is the magnetic flux through this area
The resistance of a bagel toaster is 14 ?. To prepare a bagel, the toaster is operated for one minute from a 120-V outlet. How much energy is delivered to the toaster
What is the electric potential energy of a system that consists of two protons 2.1×10?15 m apart-as might occur inside a typical nucleus
A right side view automobile mirror with a radius of curvature of 15.0 m reflects an object at a distance of 10.0 m from the mirror. calculate the magnification factor
a motor scooter trsvels east at a speed of 12 m/s. The driverthen reserves direction and heads west at 15 m/s. What is the change in velocity of the scooter? (answer in magnitude anddirection)
A cockroach of mass m lies on the rim of a uniform disk of mass 7.00 m that can rotate freely about its center like the merry-go-round. At first the cockroach and disk rotate together with an angular velocity of 0.220 rad/s. Then the cockroach walks ..
A 0.39 T magnetic field is perpendicular to a circular loop of wire with 55 turns and a radius of 13 cm. what is the magnitude of the induced emf
A player kicks a football, giving it an initial velocity of 12 m/s W, at an angle of 40 degrees up from the horizontal. A second player, standing 28 m west of the kicker, immediately starts running to meet the ball. With what velocity must the seond ..
A car travels at 40 km/h for 30 min and 60 km/h for 15 min. How far does it travel in this time
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