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Suppose the faintest star you can see with a 4-inch telescope has a magnitude of+8.0. What is the magnitude of the faintest star you could see (under the same conditions) with a 20-inch telescope?
Batteries are always labeled with their emf; for instance, an AA flashlight battery is labeled 1.5 volts. Would it also be appropriate to put a label on batteries stating how much current they pro vide? Why or why not?
Evaluate the magnitude of the apparent weight of a 84 kg astronaut 4500 km from the center of the Earth's Moon in a space vehicle accelerating toward the Moon at 3.1 m/s^2?
A)How much heat is required to convert 14.0 g of ice at -12.5oC to steam at 100.0oC ? Express your answer in joules.
A block of mass m = 1.00 kg slides along a horizontal table with speed v0 = 2.50 m/s. How far has the spring compressed by the time the block first momentarily comes to rest
An oil droplet with 15.0 excess electrons is observed between two parallel electrodes spaced 14.0mm apart. What is the radius of the droplet
An inside corner of a cube is lined with mirrors to make a corner reflector. A ray of light is reflected successively from each of the three mutually perpendicular mirrors. Show that its final direction is always eactly opposite to its initial dir..
Object A is attached to ideal spring A and is moving in simple harmonic motion. Object B is attached to ideal spring B and is moving in simple harmonic motion. The period and the amplitude of object B are both two times the corresponding values fo..
Your van is parked on a steep hill with a 12o slope with the van held in place by the parking brake. The coefficient of static friction between your van's tires and the road when wet is 0.25. Find the largest angle slope on which you can park your ..
A car with 52cm -diameter tires accelerates uniformly from rest to 20m/s in 10s. How many ties does each tire rotate
a detector has a sensitivity of 10^6 V/W and a NEP* = 10^-10 W/Hz^1/2. Light of 1E-6 W power is measured with the detector, what is the signal
Block A has a mass of 3kg and velocity of 13m/s. catching up with a second block B that has a mass of 3kg ans is moving with 5m/s in the same direction. They suffer an elastic collision and block B is now moving with 8m/s. What is the speed of blo..
As you sing in the shower, you notice that certain frequencies reverberate with setting up standing waves. If the shower is 5.8 feet long and the speed of sound is 1000 ft/sec, what are the two lowest frequencies that reverberate so?
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