Magnetic force on charged particles cause:
a. sunsets.
b. tides.
c. the aurora borealis and aurora australis.
d. changes in temperature from one season to the next.
e. the blue color of the sky.
c
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The objective and the eyepiece of a microscope have focal lengths of 4.00 mm and 25.0 mm, respectively
The objective produces a real image 30 times the size of the object. The final image is viewed at infinity, and the near point of the microscope user is at 25.0 cm. What is the distance between the object and the focal point of the objective? A) 0.13 mm B) 0.18 mm C) 0.23 mm D) 0.28 mm E) 0.33 mm
If cooking is done using an aluminum pan over an electric burner, which of the following will not promote the rate of heat flow from burner to food?
a. increase pan bottom thickness b. increase pan bottom area c. increase burner temperature d. decrease height of pan sides
When a magnetic field causes a charged particle to move in a circular path, the only quantity listed below which the magnetic force changes significantly as the particle goes around in a circle is the particle's:
a. energy. b. momentum. c. radius for the circle. d. time to go around the circle once.
A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s2 . What is the time interval required for it to reach a 10-rad displacement after starting from rest?
a. 28 s c. 56 s b. 2.0 s d. 18 s