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Q. A spring has a force constant of 254 N/m and an unstretched length of 9 cm. One end is attached to a post that is free to rotate in the center of a smooth table, as shown in the top view below. The other end is attached to a 7 kg disk moving in uniform circular motion on the table, which stretches the spring by 1 cm. What is the centripetal force Fc on the disk? Answer in units of N.
Q. An uncharged capacitor is connected to a 55.0-V battery until it is fully charged, after which it is disconnected from the battery. A slab of paraffin is then inserted between the plates.
K_paraffin = 2.2
a) What will now be the voltage between the plates?b) Find the change in energy stored in the capacitor?
A motorcycle daredevil plans to ride up a 2.50m high 25.0° ramp, sail across a 10-m-wide pool filled with hungry crocodiles, and land at ground level on the other side.
A hawk flies in a horizontal arc of radius 14 m at a constant speed of 5 m/s. (a) Find out its centripetal acceleration. (b) It continues loftly along the same horizontal arc but increases its speed at the rate of 1 m/s2. Find out the acceleration..
A U-shaped tube is open to the air at both ends and is partially filled with Mercury (density = 13,600 kg/m3). Water (density = 1000 kg/m3) is poured into the left arm until the water is 10 cm deep. How long upward from its initial position does t..
A stone has a mass of 6.0 x 10-3 kg and is wedged into the tread of an automobile tire, as the drawing shows. The coefficient of static friction between the stone and each side of the tread channel is 0.90.
Find out the potential difference between r2 and r1
A woman is running at a constant velocity of 5 m/s in an attempt to catch a stopped bus 11m ahead of her. Though, it pulls away from her with a constant acceleration of 1 m/s2. How much time does it take her to reach the bus if she keeps running a..
A 1.65 block is attached to a spring with spring constant 17. While the block is sitting at rest, a student hits it with the hammer and almost instantaneously gives it a speed of 59.
If astronauts could travel at v = 0.950 c, we on Earth would say it takes (4.20 / 0.970) = 4.42 years to reach Alpha Centauri, 4.20 light-years away. The astronauts disagree. How much time passes on astronauts' clocks? What is the distance to Alph..
What force does a 55 kg passenger exert on the seat when she is at the top of the Ferris wheel.
A solid, rectangular iron bar measures .40cm by 1.0cm by 30cm. Find the resistance between each of the three pairs of opposing faces, assume the faces in question are quipotentials.
What is the final temperature when .032kg of milk at 11C is added to .16 kg of coffee at 91C. suppose the specific heat capactieis of the two liquids are the same as water, and disregard any energy transfer to the liquid's surroundings.
what advantage might there be in using two identical capacitors in parallel connected in series with another parallelpair, rather than using a single capacitor.
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