i. Acceleration is always in the direction: A) of the displacement of the E) opp
ID: 1565917 • Letter: I
Question
i. Acceleration is always in the direction: A) of the displacement of the E) opposite to the frictional force 2. The term "mass" refers to the same physical concept as: A weight B) inertia C) force D) volume 3. A car travels east at constant velocity of 55 milehou The net force on the car is: r. A) due east 4. A car rounds a 20-m radius curve at 10 m/s. The magnitude of its acceleration in mus is: E) 0 5. A stone is thrown outward from the top of a 58.8 m high cliff with an upward velocity component of 19.6 m/s. The time in seconds that the stone will be in the air before hitting the ground is: A) 4 B) 5 (C) 6 D) 7 E) 8 6. When a 40 N force directed up along the incline is applied to a frictionless incline that is 30° above the horizontal, the acceleration of the crate is 2.0 m/s up the incline. The mass of the D) 5.8 crate in kg is: A) 20 E) 4.0 B) 17.32 7. The block s own is moving with a constant velocity on a horizontal surface. Two of the forces acting on the block are shown. 5N 3 N A frictional iorce exerted by the surface is the only other horizontal force aciag on the block. E) 8 N, 8. In a lab erperiment, a small metal cylinder is measured carefully and found to have diameter of 2.0 cm, length of 10 cm, and a mass of 85.1 gm. The density of the cylinder in gm/cm is: D) 0.678 E) none of the above C) 6.78 B) 27.1 A) 2.71 9. The vector -3A is: A) one third of the length and in the opposite direction of A B three time of the length and in the same direction of A D) same length but in the opposite direction of A 10. A vector has a component of 3 cm in the direction, a component of 4 cm in the -y direction. The magnitude and direction (angle from the +x aris) of this vector is: B) 5 cm at 307° 7 cm at 53 A) 5 cm at 53Explanation / Answer
1)
correct option is (D)
acceleration is always in the direction of the net force
2)
correct option is (B)
mass refers the concept of inertia
3)
correct option is (C)
here,
velocity is constant ===> acceleration is zero
therefore net force on the car is also zero
4)
a=v^2/r
a=10^2/20
a=5 m/sec^2
correct option is (A)
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