explain how the rate of change of flux affects the induced E.M.F. in a conductor
In: Physics
A) What will a spring scale read for the weight of a 54-kg woman in an elevator that moves upward with constant speed 5.0 m/s?
B) What will a spring scale read for the weight of a 54-kg woman in an elevator that moves downward with constant speed 5.0 m/s?
C) What will a spring scale read for the weight of a 54-kg woman in an elevator that moves upward with acceleration 0.35g?
D) What will a spring scale read for the weight of a 54-kg woman in an elevator that moves downward with acceleration 0.35 g ?
E) What will a spring scale read for the weight of a 54-kg woman in an elevator that moves in free fall?
In: Physics
Three resistors are connected in series across a battery. The value of each resistance and its maximum power rating are as follows: 6.6Ω and 17.2 W, 34.6Ω and 12.0 W, and 20.0Ω and 12.6 W. (a) What is the greatest voltage that the battery can have without one of the resistors burning up? (b) How much power does the battery deliver to the circuit in (a)?
In: Physics
Hello,
I'm using Halliday and Resnick's Fundamentals of Physics, 10th
edition. It has some equations in it that seem to contradict each
other. I know the problem is with me though, not the equations.
Electric potential energy is given as U=VQ (equation 24-3), where Q
is charge and V is voltage. We also have the equation, Q=CV
(equation 25-1), where C is capacitance. So, it looks like we could
say U=CV^2 (substituting CV from 25-1 for Q in 24-3). I know that
we cannot, since U=1/2CV^2 (equation 25-22), but I don't see where
the problem in my reasoning is.... any help would be appreciated!
(Barney style please!) Thanks!
Darrell
In: Physics
Ball 1, with a mass of 159 g and traveling at 11.0 m/s , collides head on with ball 2, which has a mass of 324 g and is initially at rest. Assume that ball 1 is traveling to the right before the collision and that the collision is one dimensional.
What is the final velocity of ball 1 if the collision is perfectly elastic?
Answer: -3.76 m/s
What is the final velocity of ball 2 if the collision is perfectly elastic?
Answer: 7.24 m/s
What are the final velocities of the combination if the balls stick together?
Answer: 3.62
How much KE was lost when the balls stuck together?
In: Physics
Use Maple to solve the problem shown below. (I know, the math is pretty easy, but that's not the point. The point is to test the capabilities of BbLearn.) Save your Maple worksheet to a PDF file and upload it here.
Note: To enter Comments into your Maple Worksheet, precede the comment with the # symbol. For example:
>f:=a*x^2+b*x+c=0;#This is a quadratic polynomial
The first part (>f:=a*x^2+b*x+c=0; ) is the Maple expression, and the second part (#This is a quadratic polynomial) is a comment.
Problem:
Pt has a work function larger than almost any other metal, 6.35 eV. What is the longest wavelength of light that can dislodge an electron from Pt metal?
In: Physics
A basic electrical circuit consists of a battery, a light bulb, a switch and wires connecting them. As soon as the switch is closed, even the light bulb is one mile away, the light bulb will be on IMMEDIATELY. This means that the electrical current (made of moving electrons) starts to run everywhere in the wire as soon as the switch is closed . Explain what happen and the source(s) of these free moving electrons.
In: Physics
Two cars approach each other. Initially they are separated by 1000 m. One car accelerates at 2 m/s^2 from rest. The other car travels at a constant speed of 20 m/s. Draw distance indicating how far from each of the cars' starting point the cars will collide.
In: Physics
Many chemical reactions release energy. Suppose that at the beginning of a reaction, an electron and proton are separated by 0.135 nm , and their final separation is 0.105 nm .
How much electric potential energy was lost in this reaction (in units of eV)?
In: Physics
A particle with charge 7 µC is located on the x-axis at the point −4 cm , and a second particle with charge 4 µC is placed on the x-axis at 8 cm . What is the magnitude of the total electrostatic force on a third particle with charge −4 µC placed on the x-axis at 2 cm ? The Coulomb constant is 8.9875 × 109 N · m2 /C 2 . Answer in units of N.
In: Physics
How can you tell if an object is charged? Explain using induction or conduction or friction.
In: Physics
A stone is dropped into a river from a bridge at a height h above the water. Another stone is thrown vertically down at a time t after the first is dropped. Both stones strike the water at the same time. What is the initial speed of the second stone? Give your answer in terms of the given variables and g.
In: Physics
Explain interactions between the following phases:
a)solid-liquid
b)solid-gas
c)gas-liquid
d)liq.1-liq.2
In: Physics
The SBD Dauntless was a dive-bomber that was used by the United States Navy during World War II. Consider one such aircraft flying with a velocity of 103 m/s at an angle θ below the horizontal. The aircraft releases a bomb when its altitude is 2.15 km above sea level. At the point when the bomb is released, the magnitude of the displacement from the bomb to its target at sea level is 2.68 km. What is the angle θ? (Give your answer in degrees. Consider θ to be a positive value, measured downward from the horizontal axis.)
_________ ° downward from the horizontal
In: Physics
1. Horses are to race over a certain English meadow for a distance of 6.4 furlongs. What is the race distance in units of (a) rods and (b) chains? (1 furlong = 201.168 m, 1 rod = 5.0292 m, and 1 chain = 20.117 m.)
2.The micrometer (1 μm) is often called the micron. (a) How many microns make up 2.2 km? (b) How many centimeters equal 2.2 μm? (c) How many microns are in 2.2 yd?
In: Physics