To make an uncharged object have a positive charge:
A. remove some neutrons
B. add some neutrons
C. add some electrons
D. remove some electrons
E. heat it to cause a change of phase
Answer: D. remove some electrons
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Which of the following molecules is most likely to show a dipole-dipole interaction?
A) H2S B) CO2 C) CH4 D) H-CImageC-H E) none of the above
Electromagnetic radiation with a wavelength of 700 nm would be:
A) X-rays. B) red light. C) violet light. D) ultraviolet light. E) microwaves.
A 200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle. The coefficients of static and kinetic friction between the puck and the ramp are µs = 0.40 and µk = 0.30,
and the puck's initial velocity at the base is 3.8 m/s parallel to the sloping surface of the ramp. What speed does the puck have when it slides back down to its starting point?
To open a very heavy door, the best place to push the door is:
a. half way between the doorknob and the hinge. b. at the end of the door where the doorknob is located. c. torque, not force, is what matters. Hence, it makes no difference where the force is applied. d. near the bottom of the door. e. close to the hinges.