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The moon's diameter is 3.48 × 106 m, and its mean distance from the earth is 3.85 × 108 m. The moon is being photographed by a camera whose lens has a focal length of 60.0 mm.
(a) Find the diameter of the moon's image on the slide film.
(b) When the slide is projected onto a screen that is 18.2 m from the lens of the projector (f = 100.0 mm), what is the diameter of the moon's image on the screen?
A length of 20-gauge copper wire (of diameter 0.8118 mm) is formed into a circular loop with a radius of 25 cm. Find the average electrical power dissipated in the process
A steel beam that is 5 m long weighs 320N. It rests on two supports, 3.00 m apart, with same amounts of the beam extending from each end. Suki, who weighs 525N, stands on the beam in the center and then walks toward one end. How close to the end c..
Assuming the Earth's magnetic field averages about 0.50×10?4 T near Earth's surface, estimate the total energy stored in this field in the first 7.0km
Suppose that the separation between two speakers A and B is 4.40 m and the speakers are vibrating in-phase, What is the largest possible distance between speaker B and the observer,
If the charge of the point charge in the figure were -2Q (instead of +Q), by what factor would the magnitude of the force on the point charge due to the dipole change.
Ina mass spectrometer, ions are directed into a magnetic field, where they curve around in the field and strike a detector. If several singly ionized atoms travel at the equal speed through the magnetic field, would you expect them all to be defle..
The bucket is released from rest at the top of a well and falls a distance 10.3 to the water. You can ignore the weight of the rope.
A cancer patient is undergoing radiation therapy in which protons with an energy of 1.2 MeV are incident on a 0.25 Kg tumour. (a) If the patient receives an effective dose of 1.0 rem, what is the absorbed dose? (b) How many protons are absorbed by..
What must the charge (sign and magnitude) of a 1.43 g particle be for it to remain stationary when placed in a downward-directed electric field of magnitude 630.
If 1.00 mol of oxygen is heated at constant pressure of 1.00 atm from 10.0?C to 25.0?C. What is the change of volume of the gas in this process
In a head-on collision, the car stops in 0.23 {rm s} from a speed of 17 {rm m}/{rm s}. The driver has a mass of 77 {rm kg}, and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fract..
The springs of a 1400 kg car compress 6.0 mm when its 68 kg driver gets into the driver's seat. If the car goes over a bump, what will be the frequency of vibrations.
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