A child's toy is suspended from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8 N. If this is the "action force," what is the "reaction force"?
A) the string pulling downward on the ceiling with an 8-N force
B) the ceiling pulling upward on the string with an 8-N force
C) the string pulling upward on the toy with an 8-N force
D) the toy pulling upward on the Earth with an 8-N force
E) the toy pushing downward on the Earth with an 8-N force
D
You might also like to view...
Which of the following polymer combinations is least likely to mix?
(a) Liquids of two different long-chain molecules with a positive enthalpy of mixing. (b) A liquid solvent and solid polymer with solubility parameters of 19 MPa0.5 and 20 MPa0.5, respectively. (c) Liquids of two different long-chain molecules with a negative enthalpy of mixing. (d) Liquids of two different short molecules with a positive enthalpy of mixing.
What are the advantages in placing the James Webb Space Telescope so far from Earth? Choose all that apply.
A.It will be closer to the objects it seeks to observe. B.There will not be any atmospheric interference. C.Light from the objects it observes will arrive at the telescope more quickly. D.Only a small portion of the sky will be blocked by Earth. E.It is unlikely to be hit by orbiting debris.
Weight and g: The mass of Pluto is 1.31 × 1022 kg and its radius is 1.15 × 106 m. What is the acceleration of a freely-falling object at the surface of Pluto if it has no atmosphere? (G = 6.67 × 10-11 N ? m2/kg2)
A. 0.661 m/s2 B. 9.81 m/s2 C. 1.62 m/s2 D. 3.72 m/s2 E. 0.140 m/s2
A person in a boat sees a fish in the water (n = 1.33), the light rays making an angle of 40° relative to the water's surface. What is the true angle (in degrees) relative to the water's surface of the same rays when beneath the surface?
a. 40 b. 35 c. 50 d. 55 e. 61