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The objective lens of the refracting telescope at the Lick Observatory in California has a focal length of 57 ft.
1. What is the refractive power of this lens?
2. What focal length (mm) eyepiece would give a magnification of 1000× for this telescope?
A long piece of wire with a mass of 0.100 kg and total length of 4.00 m is used to make a suare coil with a side of 0.100 m. Find the torque acting on the coil due to the magnetic force at equilibrium
Ice of mass 45.5 g at -10.9° C is added to 212 g of water at 15.8° C in a 101 g glass container of specific heat 0.200 cal/g-°C at an initial temperature of 22.7° C
Assuming negligible friction, determine the speed of the riders at the bottom of its arc, given the system's center of mass travels in an arc having a radius of 12.8 meter and the riders are near the center of mass in m/s
a parallel-plate capacitor with air between the plates is connected across a voltage source. this source establishes a
One of the events in the Scottish Highland Games is the sheaf toss, in which a 7.92-kg bag of hay is tossed straight up into the air using a pitchfork. Using the total impulse produced by gravity, determine how long the sheaf is airborne
An object of mass m = 2.3 g and charge Q = +48 µC is attached to a string and placed in a uniform electric field that is inclined at an angle of 30.0° with the horizontal. Find the magnitude of the electric field
An 18-year-old runner can complete a 10.0-km course with an average speed of 4.80 m/s. How much later (in seconds) should the younger runner start in order to finish the course at the same time as the older runner
A very short solenoid contains N = 20 circular loops of wire. The radius of the loop is R = 0.5 meters, what is the magnetic field in the center of the solenoid
an organ pipe is 0.155m long and closed at one end. the temperature of the air inside the pipe is 23 c.a calculate the
A cylinder of wood, density 800 kg/m^3 is 2.5 m long. Cross sectional area of the cylinder is 0,4 m^2. determine To what depth will the cylinder sink
A uniform ladder 7.30 long weighing 435 rests with one end on the ground and the other end against a perfectly smooth vertical wall. What force does the wall exert on the ladder
A handball is thrown directly upward with an initial velocity of 176 ft/sec. Draw a diagram, label velocity and time every second. Calculate the total time the ball is in the air
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