The distance to L.A. is given on freeway sign in both miles and kilometers, but

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The distance to L.A. is given on freeway sign in both miles and kilometers, but half of the sign has been ripped away. All you can see are the numbers 150 and 93. which number represents kilometers? A car has a uniform acceleration of 15 m/s^2. to the right. If it has initial velocity of 20 m/s (also to the an right) what is its final velocity after 4 seconds? A hijacker drops an 80 kg chest of gold from an airplane. Neglecting air resistance, how far does the chest fall in 5 seconds? If two objects have the same net force and have the same net acceleration, then they can't also have the same mass. (True/False) A space probe flies past Neptune with a speed of 50,000 miles/hr. Then, fuel almost entirely depleted, it heads out of the Solar System towards the emptiness of interstellar space (no gravity or friction). What the immediate future (say the next few days) hold in store for the probe? a) It will continue on a straight line course at 50,000 mi/hr. b) It will slowly speed up, c) It will gradually slow down and come to a full stop. What is the weight of a 150 kg tiger (sea level)? A man whirls a flaming torch, tied to a string, in a horizontal circle. The string is 3m long. The mass of the torch is 2 kg. The Speed of the torch is 6 m/s. What is the centripetal force on the torch? To sustain circular motion a particle must have a force behind it pushing it in the direction of the motion (in the direction of the velocity which is always along a tangent to the circle). (True/False) The Newton is the unit of You are given the mass of a certain object. You also know that there are three forces acting on the object: a force of 12 N toward the North, a force of 5 N acting toward the South, and a force of 2 N acting toward the North. If you wish to calculates the acceleration of the object, you must use (besides the given mass), a) the 12N force in Newton's 1st Law. b) the I2N force in Newton's 2nd law. c) a 9N force in Newton's 2nd Law. d) a 9N force in the 1st Law, c) a 5N force in the 3rd Law. f) a 19N force in the 3rd law.

Explanation / Answer

1) 150 (93 miles = 150 kilometers)

2) Final velocity, v = u + at = 20 + 15 x 4 = 20 + 60 = 80 m/s

3) s =ut + 1/2 at2 =0 + 1/2 gt2 = 9.8 x 25/2 = 122.5 m

4) False. If two objects have same net force and same net acceleration the objects will have same mass.

6) weight = 150 x9.8 = 1470 N

7) centripetal force =mv2/r = 2 x 62/3 = 24 N

9) Newton is the unit of force

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