Homework Statement
A rectangular loop of wire is moving toward the bottom of the page with a speed of .042 m/s. The loop is leaving a region in which a magnetic field is directed into the page; the magnetic field outside this region is zero. If during the time of 1.5 s the magnitude of the...
Homework Statement
The atomic mass of gold-197 is 196.96654 u.
How much energy is required to completely separate the nucleons in a gold-197 nucleus?
Homework Equations
E = 196.96654 u x 931.5
The Attempt at a Solution
I did the above calculation and got 1.83e5 MeV but im pretty...
Homework Statement
A proton is released from rest at t=o in a uniform electric field whose magnitude is 2.5e-8 N/C. How far has the proton traveled after .5 s?
Homework Equations
x = vot + 1/2at^2
The Attempt at a Solution
x = 1/2(9.81)(.5)^2 = 1.2 but it says the answer is...
Homework Statement
A middle-aged man starts to wear eyeglasses with lenses of 2.0 D that allow him to read a book held as close as 25 cm. Several years later, he finds that he must hold a book no closer than 35 cm to read it clearly with the same glasses, so he gets new glasses.
What is the...
Homework Statement
Which forms the larger image on the retina of your eye: a 43 ft tree seen from a distance of 210 ft, or a 12 in flower viewed from a distance of 2.0 ft?
Homework Equations
none?
The Attempt at a Solution
I don't really understand how you would go about working...
Homework Statement
Your friend is 1.7 m tall.
What is the height of her image when she is 4.2 m from you?
Homework Equations
I used di/do and multiplied that by the height of the friend
The Attempt at a Solution
I did (4.2/3.5)(1.7) but it was wrong. Not really sure what I'm...
Homework Statement
An object is located 27.5 cm from a certain lens. The lens forms a real image that is twice as high as the object.
b) Now replace the lens used in Part A with another lens. The new lens is a diverging lens whose focal points are at the same distance from the lens as the...
Homework Statement
While studying physics at the library late one night, you notice the image of the desk lamp reflected from the varnished tabletop. When you turn your Polaroid sunglasses sideways, the reflected image disappears.
If this occurs when the angle between the incident and...
Homework Statement
A kitchen has twin side-by-side sinks. One sink is filled with water, the other is empty.
1) Does the sink with water appear to be deeper, shallower, or the same depth as the empty sink?
2) Choose the best explanation from among the following:
a) The sink with...
Homework Statement
The virtual image produced by a convex mirror is one-quarter the size of the object.
b) What is the focal length of this mirror?
Homework Equations
1/di = 1/f - 1/do
The Attempt at a Solution
i found di to be -9.3 cm but when i solved for f i keep getting it...
Homework Statement
Shaving/makeup mirrors typically have one flat and one concave (magnifying) surface. You find that you can project a magnified image of a lightbulb onto the wall of your bathroom if you hold the mirror 2.0 m from the bulb and 3.7 m from the wall.
a) What is the...
Homework Statement
You are 1.9 m tall and stand 3.5 m from a plane mirror that extends vertically upward from the floor. On the floor 1.5 m in front of the mirror is a small table, 0.80 m high.
a) What is the minimum height the mirror must have for you to be able to see the top of the...
Homework Statement
You want to make a solenoid that is 38 cm long with 4300 turns. How much current should you run through the solenoid to produce a magnetic field of .75 T?
Homework Equations
B = uoNI
The Attempt at a Solution
I converted 38 cm to m (not sure where to use this...
Homework Statement
1)A concave mirror produces a virtual image that is three times as tall as the object.
a) If the object is 21 {\rm cm} in front of the mirror, what is the image distance?
b) What is the focal length of this mirror?
Homework Equations
hi/ho
di/do
1/f= 1/do...