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Q. An object 12.0 cm tall is placed at the zero mark of a meterstick. A spherical mirror located at some point on the meterstick creates an image of the object that is upright, 4.00 cm tall, and located at the 43.0 cm mark of the meterstick. Where is the mirror? What is the mirror's focal length?
Q. The two springs each have a spring constant of 11.0 . They are stretched by 1.00 when a current passes through the wire. How big is the current?
What is an average speed of this train
A hydraulic lift consists of two pistons that connect to each other by an incompressible fluid. If one piston has an area of 0.49 m^2 and the other an area of 6.2m^2, how big a mass can be raised by a force of 220N exerted on the smaller piston.
Approximate the position of both peaks 30 years after they were spilled. Estimate the expected future arrival time of both peaks at the water table.
Two boxes, m1 = 1.0 kg with a coefficient of kinetic friction of 0.10, and m2 = 2.0kg with a coefficient of 0.20, are placed on a plane inclined at 0 = 30o.
What type of weather front will be responsible for the following weather forecast? "Cool today with rain becoming heavy by this afternoon. Slightly warmer tomorrow. "Winds south easterly becoming westerly to north westerly by the tomorrow morning."
A uniform plank of length 5.8m and weight 229N rests horizontally on two supports, with 1.10 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 450N walk on the overhanging part of the plank be..
You and the friend each drive 47.0 km. You travel at 87.0 km/h; your friend travels at 98 km/h. How long will your friend wait for you at the end of trip.
A 73 kg parachutist descends during a vertical height of 420 m with constant speed. Find the increase in entropy produced by the parachutist; assume the air temperature is 21°C.
Find out vertical and horizontal components of the pendulum
What is the minimum coefficient of friction that will prevent sliding. What should be the highest speed of the car so it can round the curve safely.
Conclude a rough "scale factor" or "plate scale." Measure the distances in mm or cm between each of the marked wavelengths and average the results.
What's the advantage of launching space vehicles from high flying aircraft in place of from the ground.
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