Seyda Jemal 2022-07-14
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asked 2020-12-30

A majorette in a parade is performing some acrobatic twirlingsof her baton. Assume that the baton is a uniform rod of mass 0.120 kg and length 80.0 cm. 
With a skillful move, the majorette changes the rotation ofher baton so that now it is spinning about an axis passing throughits end at the same angular velocity 3.00 rad/s as before. What is the new angularmomentum of the rod?

asked 2021-01-13

A cubic block of wood, 10.0 cm on each side, floats at the interface between oil and water with is lower surface 1.50 cm below the interface. The density of oil is 790 kg/m(cubic). a) what is the gauge pressure on the upper surface of the block? b) what is the gauge pressure on the lower surface of the block? c) what is the mass and density of the block?

asked 2022-06-01

A 12,600-kg railroad car travels alone on a level frictionless track with a constant speed of 18.0m/s. A 5350-kg load, initially at rest, is dropped onto the car. What will be the car’s new speed?

 

asked 2022-05-28

Charge Q is distributed uniformly throughout a spherical insulating shell. The net electrical flux in Nm2
/C 
through the outer surface of the shell is: 

asked 2022-08-31

A rocket is launched at an angle of 53.0° above the horizontal with an initial speed of 100 m/s. 
The rocket moves for 3.00 s along its initial line of motion with an acceleration of 30.0 m/s2
. At 
this time, its engines fail and the rocket proceeds to move as a projectile. Find (a) the maximum 
altitude reached by the rocket, (b) its total time of flight, and (c) its horizontal range.

asked 2022-08-14

A 95.0-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.80 m/s2 , (b) moving upward at a constant speed, and (c) accelerating downward with an acceleration of 1.30 m/s2 ?

asked 2022-05-23

A 15 - k_{B} block is dragged over a rough, horizontal surface by a constant force of 70 N acting at an ungle of 20 above the horizontal. The block is displaced 5 m, and the coefficient of kinetic friction is 0.3. Find the work done by (a) the 70-N force, (b) the force of friction, (e) the normal force, and (d) the force of gravity. (e) What is the net work done on the block!

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