(a) A block of mass m = 3.90 kg is suspended as shown in the diagram below. Assume the pulley to be frictionless and the mass of the strings to be negligible. If the system is in equilibrium, what will be the reading of the spring scale in newtons? N
(b) Two blocks each of mass m = 3.90 kg are connected as shown in the diagram below. Assume the pulley to be frictionless and the mass of the strings to be negligible. If the system is in equilibrium, what will be the reading of the spring scale in newtons? N
(c) A block of mass m = 3.90 kg is in equilibrium on an incline plane of angle θ = 28.0° when connected as shown in the diagram below. Assume the mass of the strings to be negligible. If the system is in equilibrium, what will be the reading of the spring scale in newtons? N
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The figure is a section of a conducting rod of radius R1 = 1.45 mm and length L = 12.60 m inside a thin-walled coaxial conducting cylindrical shell of radius R2 = 10.7R1 and the (same) length L. The net charge on the rod is Q1 = +3.56
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We observe a glancing collision between two billiard balls of the same mass. The first ball is incident at a speed of 6.36 m/s, strikes the second ball (initially at rest) and moves off with a speed of 5.54 m/s at an angle of 29.5
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(a)i. Name five common feautures of catalysis ii. Describe adsorption, desorption, physisorption and chemisorption. (b) Draw a labeled phase diagram for water and explain it briefly.
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A ski starts from rest and slides down a 30 ∘ incline 70 m long.
A)If the coefficient of friction is 0.075, what is the ski's speed at the base of the incline?
B)If the snow is level at the foot of the incline and has the same coefficient of friction, how far will the ski travel along the level? Use energy methods.
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A 0.130-kg cube of ice (frozen water) is floating in glycerine. The gylcerine is in a tall cylinder that has inside radius 3.20 cm . The level of the glycerine is well below the top of the cylinder.
f the ice completely melts, by what distance does the height of liquid in the cylinder change?
Express your answer with the appropriate units.
Does the level of liquid rise or fall? That is, is the surface of the water above or below the original level of the gylcerine before the ice melted?
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The Ads side of the AdS/CFT correspondence is a model of quantum gravity in 5 dimensional antidesitter space. What can it say about quantum gravity in our 4-spacetime dimensions? Or is it just a toy model to better our understanding of quantum gravity as a whole?
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Under normal conditions, you are just barely able to lift a mass of 91 kg. Your friend drops a box of volume 7 m3 into a lake. If you are just able to lift it to the surface (so that it is still completely submerged), what is the mass of the box?
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A.) 1 L of oxygen gas has a temperature of 0
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One model for the length of a person's ACL (LACL, in millimeters) relates it to the person's height (h, in centimeters) with the linear function
LACL = 0.4606h ? 41.29.
Age, gender, and weight did not significantly influence the relationship.
(a) If a basketball player has a height of 2.37 m, how long is
his ACL?
1 cm
(b) If a pressure of
8 ? 106 N/m2
is applied to his ligament, how much will it stretch?
2 cm
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Three ideal polarizing filters are stacked, with the polarizing axis of the second and third filters at 29.0? and 55.0?, respectively, to that of the first. If unpolarized light is incident on the stack, the light has intensity 75.0W/cm2 after it passes through the stack.
1. If the incident intensity is kept constant, what is the intensity of the light after it has passed through the stack if the second polarizer is removed?
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Two ice skaters, Daniel (mass 69.2 kg) and Rebecca (mass 50.1 kg) are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, who is moving at12.7 m/s before she collides with him. After the collision, Rebecca has a velocity of magnitude 6.8 m/s at an angle of 50.1° from her initial direction. Both skaters move on the frictionless, horizontal surface of the rink.
(a) What are the magnitude and direction of Daniel's velocity
after the collision?
m/s
(b) What is the change in total kinetic energy of the two skaters
as a result of the collision?
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