Physics 101
20 April 2015
Induction & Transformers
RHR (Right Hand Rules) #1
Current-carrying wires
-thumb points along current, fingers curl in direction of magnetic field
RHR #2
Force on a moving q
- fingers point along motion of q*
- - B-field points o
HW#10b
Note: numbers used in solution steps are different from your WebAssign values.
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a). For Spring 2, Spring force: F=k*x, x=0.6-0.1 =0.5 (m), Spring Force = object weight = 3 (N)
k = F/ x =3/0.5= 6 (N/m)
b.) For Spring 3, F= k*x, x=1.1-0.1
HW#8b
Note: numbers used in solution steps can be different from the question part. You can practice the methodsof 7
Page 1 in
the solution and verify with the numbers and answers given in the question part. Or you should practice the
methods in the solut
7. (a) Find the x and y components of a position vector, r, of magnitude r = 76 m, if its angle relative to the +x axis is 10.0. 74.8 m (x component) (b) What if the relative angle is instead 80.0? 13.2 m (x component) 74.8 m (y component) Solutions: a).
HW#4a
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Problem 1 (Walker Ch. 5 P. 2). In a grocery store, you push a [15.5] kg shopping cart with a force of
[10.5] N. If the cart starts at rest, how far does it move in 3.00 s?
F
m
m
r
F
x
" F = ma "
x : F = max
The figure above illustrates t
HW#3b
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2D motion: Rule of thumb: treat horizontal directions motion separately from vertical motion.
Initial velocity v0 may have two components: in x direction and y direction, v0x or v0y. Use
the given angle and sin or cos to calculate v0x or
HW#6b
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Problem 1. A block of mass m slides from rest on a frictionless loop-the-loop track, as shown in Figure (a) What is the minimum release height, h, required for the block to maintain contact with the track at all times? Give your answer i
HW#4b
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Problem 1. A 100 kg person stands on a scale.
a.) What would be the scale readout?
(How does this compare with the person's weight?)
b.) If the person stands on the scale in an elevator accelerating upwards at 5 m/s2, what is the scale r
Exam #3 Study Guide
Physics 101
Chapter 19-21: Sound
Properties of Waves
1. Frequency
a. The number if times per second that a wave vibrates up and down
b. Frequency = 1/Period
2. Wavelength
a. The distance between two wave peaks
3. Amplitude
a. The dista