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A spring (k = 812 N/m) ishanging from the ceiling of an elevator, and a 4.8 kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length)when the elevator is accelerating upward at a =0.23 m/s2?
An object starts from rest at the origin and moves along the x axis with a constant acceleration of 4 m/s2 . Its average velocity as it goes from x =2m to x = 8m is:
Two identical coaxial coils of wire of radius 39.7 cm are directly on top of each other, separated by a 3.03 mm gap. Determine the magnitude that the current in the upper coil
The hunter uses a small powerboat that moves at a maximum speed of 14 km/h with respect to the water. Illustrate what is the minimum time necessary for crossing?
In fact, the increased normal force at these large angles makes force of friction too large to move the lawnmower at all.
A proton moves through a magnetic field at 29.7% of the speed of light At a location where the field has a magnitude of 0.00639 T and the proton's velocity makes an angle of 119 degree with the field. what is the magnitude of the magnetic force actin..
a cubic cardboard box of side a 0.430 m is placed so that its edges are parallel to the coordinate axes. there is no
A homemade capacitor is assembled by placing two 7 in pie pans 10 cm apart and connecting them to the opposite terminals of a 9 V battery. Estimate the work done by the battery to charge the plates
A diffraction grating with 395 lines/mm is 1.00 m in front of a screen. What is the wavelength of light whose first-order maxima will be 16.9 cm from the central maximum on the screen.
a 35 kg boy sits atop a sphere of frictionless ice of radius r=2.0m. He begins to slide and eventually falls off. How far above the ground does he lose contact with the ice
At a rock concert, a dB meter registered 130 dB when placed at a2.8 m in front of a loudspeaker on the stage. (a) what was thepower output of the speaker assuming uniform spherical ofthe sound and neglecting absorption in the air?(b) how far awaywoul..
A 40 kg crate is pulled across a rough horizontal surface with a force of 350 N at an angle of 25o above the horizontal. What is the horizontal acceleration, in m/s2, of the crate
A cart of mass m = 1.4 kg is released from the top of a ramp sloped ? = 13° relative to the horizontal. The length of the ramp is L =9.6 m. find the car's Kinetic Energy at the bottom of the ramp
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