A 50-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 30.0° below the horizontal is applied to the box
The coefficient of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.30. What is the force of friction on the box?
A) 250 N B) 200 N C) 32 N D) 620 N E) 220 N
E
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What is the total energy stored in the group of capacitors shown if the charge on the 30-?F capacitor is 0.90 mC?
a.
29 mJ
b.
61 mJ
c.
21 mJ
d.
66 mJ
e.
32 mJ
Which of these statements is true for the image formed by spherical mirror?
A. real images of real objects are always inverted B. virtual images of real objects are always in front of the mirror C. virtual images of real objects are always upright D. real images are always in back of the mirror
Unpolarized light is incident upon two polarization filters that do not have their transmission axes aligned. If of the light passes through this combination of filters, what is the angle between the transmission axes of the filters?
A) 53° B) 73° C) 85° D) 80°
A(n) ______________ is an elementary particle with no charge
a. electron b. neutron c. proton d. atom