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19. The root-mean-square speed of oxygen molecules at 300K is approximately
(A) 0.48 m/s
(B) 4.8 m/s
(C) 48 m/s
(D) 480 m/s.

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相關試題

1. A child of mass M is swinging on a swing of length L to a maximum deflection angle of θ. A man of mass 4M is swinging on a similar swing of length L to a maximum angle of 2θ. Each swing can be treated as a simple pendulum undergoing simple harmonic oscillation. If the period for the child's motion is T, then the period for the man's motion is (A) T (B) 2T (C) T/2 (D) T/4.

2. An object is moving in a circular path. If the centripetal force is suddenly removed, how will the object move? (A) It will move radially outward. (B) It will move radially inward. (C) It will move vertically downward. (D) It will move in the direction in which its velocity vector point at the instant the centripetal force vanishes.

3. A 3.0-kg broom is leaning against a coffee table. A woman lifts the broom handle with her arm fully stretched so that her hand is at a distance of 0.45 m from her shoulder. What torque is produced on her if her arm is at an angle of 50° below the horizontal? (sin50° = 0.766, cos50° = 0.6428) (A) 7.0 N-m (B) 5.8 N-m (C) 8.5 N-m (D) 10.1 N-m.

4. Two planets have the same radius, R. Each planet has a constant density, but the density of planet 2 is twice as high as that of planet 1. Identical objects of mass m are placed on the surfaces of the planets. What is the relationship of the gravitational potential energy U₁, on planet 1 to U₂ on planet 2? (A) U₁ = U₂ (B) U₁ = 2U₂ (C) U₁ = ½U₂ (D) U₁ = 4U₂.

5. A disk of clay is rotating with an angular velocity ω along with a blob of clay stuck to the outer rim of the disk. The blob has a mass of of the disk. If the blob detaches and flies off tangent to the outer rim of the disk, what is the angular velocity of the disk after the blob separates? (A)(B) (C) (D) ω.

6. Consider two carts, of masses m and 2m, at rest on a frictionless air track. If you push the lower-mass cart for 3 s and then the other cart for the same length of time and with the same force, which cart undergoes the larger change in momentum? (A) The cart with mass m. (B) The cart with mass 2m. (C) Same for both carts. (D) It is not possible to tell from the information given.

7. A block of mass 5.0 kg slides without friction at a speed of 8.0 m/s on a horizontal table surface until it strikes and sticks to a mass of 3.0 kg attached to a horizontal spring (with spring constant k = 1250.0 N-m), which in turn is attached to a wall. How far is the spring compressed before the mass come to rest? (A) 0.30 m (B) 0.40 m (C) 0.54 m (D) 0.67 m.

8. An electrical insulator is a material: (A) containing no electrons. (B) through which electrons do not flow easily. (C) that has more electrons than protons on its surface. (D) that cannot be a pure chemical element.

9. The electric field at a distance of 10 cm from an isolated point particle with a charge of 2×10⁻⁹ C is: (A) 1.8 N/C (B) 180 N/C (C) 18 N/C (D) 1800 N/C.

10. A conducting sphere of radius 0.01 m has a charge of 1.0×10⁻⁹ C deposited on it. The magnitude of the electric field in N/C just outside the surface of the sphere is: (A) 0 (B) 450 (C) 900 (D) 4500.

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