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A charge of 27.0nC is placed in a uniform electric field that is directed vertically upward and that has a magnitude of 4.00×104 N/C. What work is done by the electric force when the charge moves 2.60 m at an angle of 45.0 degrees downward from the horizontal?
A hollow cubical box is 4.09 m on an edge. This box is floating in a lake with one-third of its height beneath the surface. What is the depth of the water in the box at the instant the box begins to sink
A 10 g bullet traveling at 430m/s strikes a 13kg , 1.1-m-wide door at the edge opposite the hinge, What is the angular velocity of the door just after impac
Consider two widely separated conducting spheres, 1 and 2, the second having twice the diameter of the first, What is the ratio of the final surface charge density of sphere 1 to that of sphere 2
You're viewing a pair of green (wavelength=550nm) butterflies on a tree branch. What is Rayleigh's minimum angle for resolution
A woman is reported to have fallen 139 ft from a building, landing on a metal ventilator box, which she crushed to a depth of 30 in. She suffered only minor injuries.
What friction torque is required to reduce angular speed
A rectangular fish tank measures 30 cm by 65 cm by 40 cm high. What is the total force of the water on the bottom
A 1,200 W hair dryer is operated on a 120 V circuit for 15 minutes. If electricity costs $0.10/kW h, what was the cost of using the blow dryer.
Photographic cameras on spy satellites supposedly can read the license plate of a car on the ground. How large is the diameter of the camera required for such a feat
Draw a picture of a moving source and the waves surrounding it according to what you observed in this experiment. How does the spacing of the wavefronts in front of the source compare to those behind it?
To fit a contact lens to a patient's eye, a keratometer can be usedto measure the curvature of the cornea-the front surface of theeye. Determine the radius of curvature of the cornea
At a temperature of 5800, hydrogen atoms in the solar atmosphere have typical random speeds of about 12. Assume that spectral-line broadening is simply the result of atoms moving toward us or away from us at this random speed, estimates thermal width..
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