STRAIGHTER LINE PHYSICS ACTUAL

STRAIGHTER LINE PHYSICS ACTUAL

EXAM -

AND ACCURATE ANSWERS WITH 160+

QUESTIONS VERIFIED 100%

When a small car pulls a trailer for a move, which of the following explains why the trailer moves?ANSWERS While the force of the trailer on the car is equal and opposite to the force of the car on the trailer, the total of all forces acting on the car are unbalanced.A 2.5 kg object is suspended from a spring with a spring constant of 48 N / m. The mass is pulled 0.25 m downward from its equilibrium position and released. Which of the following is the maximum kinetic energy of the object?

ANSWERS 1.5 J

Why is (vector) A⋅ (vector) B =AxBx+AyBy ANSWERS All the cross-terms are equal to zero.An amusement park game consists of throwing a quarter into a small bowl. If you win, you get to take home a giant purple stuffed elephant.The dish is on a shelf that is 0.4 m above the point where the quarter leaves your hand. The horizontal distance between the bowl and the place where the quarter leaves your hand is 1.8 m. Ignoring air drag, if you toss the quarter at an angle of 60°, what initial velocity is needed to bring home the giant purple stuffed elephant?ANSWERS 4.8 m / s

If the x-component of a vector is 3 and the y-component is 4, what is the magnitude of the vector?

ANSWERS 5

Which of the following is involved in uniform circular motion?ANSWERS constant angular velocity

Match each of the following descriptions of motion with the appropriate graph.resting uniform motion accelerated motion oscillating motion

ANSWERS 1-B; 2-D; 3-C; 4-A

A juggler is juggling 3 balls. If she throws them 2.4 m in the air at an angle of 80° relative to the horizontal, what is the time between throws? (You should ignore air drag and the time it takes for the juggler to move balls from one hand to the other.) ANSWERS 0.47 s Given the vectors C=1.5i^+6.2j^ and D=4.4i^+7.3j^, calculate the magnitude of their vector product.

ANSWERS 16.3

Which of the following statements concerning friction between the surfaces of two objects is correct?ANSWERS The force of friction mostly depends on the nature of the two surfaces.

As shown, a crate of oranges and a crate of apples, each with a different mass, are attached by a rope (with tension Toa). A second rope (To ) is attached to the crate of oranges, and the entire system is pulled with a constant acceleration a by this rope. Which of the following is true of the tensions?ANSWERS Toa > To How can you calculate the magnitude of a vector using scalar products?ANSWERS Multiply it by itself and take the square root.Suppose you weigh an object and the reading you get from the scale is 0.0070 kg. How many significant digits does your measurement have?ANSWERS Two Consider two objects sliding down an incline without rolling. If the objects don't have the same mass, the heavier object will accelerate at a faster rate than the lighter one.ANSWERS false Which of the following statements concerning friction between the surfaces of two objects is correct?ANSWERS The force of friction mostly depends on the nature of the two surfaces.Calculate x=vt+1/2at2, where v = 0.227 m/s. t = 11.1s, and a = 9.80 m/s2.ANSWERS 606 m Which of the following statements concerning friction is incorrect?

ANSWERS The force of static friction ( fs ) between parallel surfaces in

contact is given by: fs = μsN.

A car travels with a speed of 3.5 m / s, and then accelerates to 5.5 m / s in 4 s. Which of the following is the average acceleration of the car?ANSWERS 0.5 m / s2 Suppose you are driving a car at a constant speed of 40 mph in a straight line. All of a sudden the road curves to the right but you manage to keep driving at exactly the same speed. Which of the following statements is correct?ANSWERS There was a net force acting on the car.Given the vectors C=2i^+7j^ and D=14i^+38j^D, find the angle θ between them.

ANSWERS θ=4∘

If the cross product of a vector of length 5 and a vector of length 3 results in a vector of length 10, what is the angle between them?

ANSWERS 42°

A vector is quantity that requires both magnitude and ________.ANSWERS direction King Kong is holding a woman on top of a skyscraper when she suddenly slips out of his hand. How tall is the building if Superman has a minimum time of 2.30 s to catch the woman before she hits the ground?ANSWERS 25.9 m