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The telescope at Yerkes Observatory in Wisconsin has an objective whose focal length is 19.4 m. Its eyepiece has a focal length of10.0 cm.
(a) What is the angular magnification of the telescope?
(b) If the telescope is used to look at a lunar crater(diameter = 7910 m), what is the size of the first image, assuming the surface of the moon is 3.77 × 108 m from the surface of the earth?
(c) How close does the crater appear to be when seen through the telescope?
A force of F=9.0i+8.0jN is applied to an object about a fixed axis aligned with the z direction. If the force applied at the point (6.00 m, 9.00 m), illustrate what is the magnitude and direction of the torque?
A tungsten wire has a radius of 0.070 mm and is heated from 20.0 to 1330 oC. The temperature coefficient of resistivity is ? = 4.5 x 10-3 (Co)-1, How long is the wire
A kayaker needs to paddle north across a 200 wide harbor. The tide is going out, creating a tidal current that flows east at 2.0. The kayaker can paddle with a speed of 3.0. In which direction must he paddle in order to travel straight across the har..
A defibrillator consists of a 15.3-µF capacitor that is charged to 8.4 kV. (a) If the capacitor is discharged in 1.0 ms, how much charge passes through the body tissues? (b) What is the average power delivered to the tissues?
A hot-air balloon consists of a basket, one passenger, and some cargo. Let the total mass be M. Find the upward lift force in terms of the initial total weight Mg
A child suddenly runs into the street. If it takes the driver 0.80 s to react and apply the brakes, explain how many meters will the car have moved before it begins to slow down?
A 6 foot person stands at the bottom of a 10ft pool filled with water. How much pressure is exerted on the person's head
If a capacitor has the initial charge of 5.0uC, L = 0.080H, C = 10uF, and R = 0, What is the maximum energy stored in the inductor
How many 65W light bulbs can be connected in parallel across a potential difference of 85 V before the total current in the circuit exceeds 2.10A.
An athlete at the gym holds a 1.2 kg steel ball in his hand. His arm is 64 cm long and has a mass of 4.0 kg. Evaluate the magnitude of the torque about his shoulder if he holds his arm straight, but 30 degrees below horizontal?
q1. a wheel 38 cm in diameter accelerates uniformly from 240 rpm to 360 rpm in 6.5 s. how far will a point on the edge
A speed skater moving across frictionless ice at 8.80 hits a 4.20-m-wide patch of rough ice. What is her acceleration on the rough ice
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