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Suppose, you live in a place on the equator. There is a vertical rod of length 2m on your roof top. One morning, you went to the roof top and observed the shadow of the rod. If the length of the rod was 1m, then what time was that?
A flask is filled with 1.55 L (L = liter) of a liquid at 98.7 °C. When the liquid is cooled to 15.7 °C, its volume is only 1.32 L, however. obtain the coefficient of volume expansion of the liquid
A child is riding across a rough field on a sled. Together, she and the sled have a mass of 73 kg. The sled is being pulled by her brother at an angle of 16º with a force of 356 Newtons. What is her acceleration if the coefficient of kinetic friction..
A hydrogen atom has a radius of about 0.05 nm. (a) Estimate the uncertainty in any component of the momentum of an electron confined to a region of this size. in kg · m/s (b) From your answer to (a), estimate the electron's kinetic energy in three di..
A mica sheet that is 1.19 µm thick is suspended in air. In reflected light, there are gaps in the visible spectrum at 402, 452, 517, and 603 nm. Find the index of refraction of the mica sheet
On a certain amusement park ride, passengers are seated in a horizontal circle of radius 7.5m. the seats begin to rotate from rest and are uniformly accelerated for 21 seconds to a most rotational speeds of 1.4 rad/s.
Consider a wheel on a racing bicycle. If the wheel has a mass of 0040 kg and an angular speed of 15 rad/s, what is the rotational kinetic energy of the wheel
Since you are pulling up a little on the crate, the floor doesn't have to support as much weight. When you are pulling up on the rope as described above, what is the upward force that the floor exerts on the crate.
A shell is fired with a horizontal velocity in the positive x direction from the top of an 80-m high cliff. What is the speed of the shell as it hits the ground
Large meteorites are hardly slowed by Earth's atmosphere. how long does it take to reach the ground
The speed of an arrow fired from a compound bow is about 29 m/s. An archer sits astride his horse and launches an arrow into the air elevating the bow at an angle of 35 degrees above the horizontal, What is the arrow range
an electron is released from rest at the negative plate of a parallel plate capacitor and accelerates to the positive
q1. all through its evolution a star of 1 solar mass the mass of our sun expands to 3.33 times its original radius.
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