Ch 11-12
A 66 N pumpkin vibrates with a period of 2.9 s when attached to the end of a spring scale. What is the spring constant?
What is 32 N/m?
T = 2(pi) x SR(m/k)
Two mirrors make an angle of 120 degrees with each other. A ray is incident on mirror M1 at an angle of 65 degrees to the normal. Find the angle the ray makes with the normal to M2 after it is reflected from both mirrors.
What is 55 degrees?
90 - 65 = 25
120 + 25 + x = 180
x = 35
90 - 35 = 55 degrees
A flashlight beam strikes the surface of a pane of plastic (n=1.26) at 44 degrees to the normal. What is the angle of refraction?
What is 33.4 degrees?
1.00 sin44 = 1.26 sin (angle)
Calculate the repulsive force between two protons in the nucleus of an atom of iron separated only by 1.4 x 10^-15 m.
What is 117.7 N?
F = k (q)(q) / r^2
Three 3.2V, 1.78 A lightbulbs are connected in parallel to a 12V battery. Find the equivalent resistance and the current.
3.2V = 1.78A (R)
R = 1.8 ohms
1/Req = 1/1.8 (3) ... Req = 0.6 ohms
12V = I (0.6 ohms)
I = 20 A
At a maximum level of loudness, the power output of portable radio headphones radiated as sound is 0.0276 W. What is the intensity of those sound waves to a jogger whose ear is 5.0 cm from the headphone's speaker?
What is 0.88 W/ m^2?
Intensity = P / 4(pi)(r^2)
An object is 10.0 m from an external rearview convex car mirror with a radius of curvature of 16.0 m. Find the LOST image.
What is...
L: di = -4.4 cm
O: upright
S: smaller
T: virtual
A 1050 line/cm grating produces a 3rd order fringe at 44 degrees. What wavelength of light is being used?
What is 2.2 x 10^-6 m?
d sin (angle) = m (wavelength)
Two parallel plates are separated by 0.042 cm. Between the plates is a uniform electric field having a magnitude of 650 N/C. What is the potential difference between the plates?
What is -0.273 V?
V = -E(d)
The force on a wire carrying 8.5 A is a maximum of 1.8 N when placed between the pole faces of a magnet. If the pole faces are 51.5 cm in diameter, what is the magnetic field strength?
What is 0.4 T?
F = I x L x B