calculate 25.8 x 70.0 using the proper significant figure s Problem 1: (30 point

Question

calculate 25.8 x 70.0 using the proper significant figure s Problem 1: (30 points total. 2 points each) Answer the following conceptuad question by circling the most appropriate response from the answer choices given 1.1: Calculate 25.8 x 70.0 using the proper number of significant figures a) 1806.0 806 c) 1810 d) 1800 e) 2000 1.2: A person is driving a car down a straight road The instantaneous acceleration constant and directed opposite the direction of the cars motion. The speed of the car is a) increasing b) decreasing constant increasing but will eventually decrease. e) decreasing but will eventually increase 1.3 You toss a ball into the air at an angle 40 from the horizomal. At what point in the ball's trajectory does the ball have the smallest speed? (Neglect the effects due to aur resistance a) just after it is tossed b) at the highest point in its flight c) just before it hits the ground d) halfway between the ground and the highest point on the rise of the trajectory e) halfway between the ground and the highest point on the fall of the trajectory 1.4:/A block is sliding down the ramp. How does the magnitude of the normal force exerted by the ramp compare to the weight of the block? The normal force is a) equal to the weight of the block. b) greater than the weight of the block c) less than the weight of the block. d) possibly equal to or less than the weight of the block, depending on whether or not the ramp surface is smooth. e) possibly greater than or equal to the weight of the block, depending on whether or not the ramp surface is smooth. 1.5: Ash and Bobby are twins who have the same weight. Ash drops to the ground from tree at the same time that Bobby begins his descent down a frictionless slide. If they bot start at the same height above the ground, how do their kinetic energies compare when they hit the ground? a) Ash has greater kinetic energy than Bobby. bby has greater kinetic energy than Ash. c) They have the same kinetic energy d) Bobby has twice the kinetic energy as Ash. More information is required to compare their kinetic energies.

Explanation / Answer

1.1) (b)1806

25.8 x 70 = 1806

1.2) (b)decreasing

since the acceleration is directed in the direction apposite direction to that of motion.

1.3) (b)at the highest point in its flight

We know that the ball wil momentarily stop at the highest point, so having the smallest velocity or zero velocity.

1.4) (c)Less than the weight of the block.

1.5) (b)Bobby has greater KE Than Ask

Since the three must be having friction, so energy will be dissipated due to it fr Ash and slide do not have friction, so no eneregy will be dissipated for Bob

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