FREE AND STUDY GAMES ABOUT PHYS MISCONCEPT 1-4

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FREE AND STUDY GAMES ABOUT PHYS MISCONCEPT 1-4

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -27 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: a student weighs herself on a digital bathroom scale as 117.4 lb. if all the digits displayed reflect the true precision of the scale, then probably her weight is..

• within 1% of 114.7 lb
• exactly 117.4 c)between 117.38 and 117.42
• 117.2 and 117.6

Answer:

• - One common misconception, as indicated by answers (b) and (c), is that digital measurements are

inherently very accurate. A digital scale is only as accurate as the last digit that it displays

Question 2: [L^2] represents the dimensions for which of the following?

• cm^2
• square feet
• m^2
• all of the above

Answer:

D - This addresses the fact that the generic unit symbol, like [L], does not indicate a specific system of units.

Question 3: a bullet fired from a rifle begins to fall

• as soon as it leaves barrel
• after air friction reduces speed
• not at all if air resistance is ignored

Answer:

A - the bullet falls due to the influence of gravity, not due to air resistance.

Question 4: how many significant figures does 1.362 + 25.2 have?

Answer:

• - When you add or subtract numbers, the final answer should contain no more decimal places than the

number with the fewest decimal places. Since 25.2 has one decimal place, the answer must be rounded to one decimal place, or to 26.6.

Question 5: chapter 2 #8 , #9

Answer:

answer is #8 b and c #9 = a

Question 6: the magnitude of a component of a vector must be

• less than or equal to the magnitude of vector
• equal to magnitude of vector
• > or equal to vector
• less than, equal to, greater than magnitude of vector

Answer:

A - The components of a vector make up the two legs of a right triangle when the vector is the hypotenuse. The legs of a right triangle cannot be longer than the hypotenuse

Question 7: which is NOT true abt an order-of-magnitude estimation?

• it gives you a rough idea of answer
• it can be done by keeping only1 sig fig
• it can be used to check if exact calculation is reasonable
• it will always be accurate to at least 2 sig figs

Answer:

D

Question 8: you drop a rock off a bridge, when the rock has fallen 4 m you drop a second. as the

• fall, what happens to their velocities.
• both increase at same rate
• velocity of first is faster than second
• velocity of second > first
• both are constant

Answer:

A - Since the distance between the rocks increases with time, a common misconception is that the velocities are increasing at different rates. However, both rocks fall under the influence of gravity, so their velocities increase at the same rate.Question 9: one ball is dropped from window. at same time, a second ball is thrown horizontally from same window. which ball has greater speed at ground level?

• dropped
• thrown
• neither
• depends on how hard ball was thrown

Answer:

B - vertical speeds of both are same - The ball thrown horizontally will have a horizontal component of velocity in addition to the vertical component. Therefore, it will have the greater speed.

Question 10: ch 3 # 11

Answer:

answer - B and E

Question 11: #5 chapter 3

Answer:

answer: B - Assuming that we ignore air resistance, the ball is in free fall after it leaves the bat.Question 12: a ball is thrown straight up, what are the velocity and the acceleration of the ball at the highest point in its path?

• v=0, a =0
• v=0, a=+9.8 c)v=0, a =-9.8
• v=+9.8, a=0
• v=-9.8, a=0

Answer:

C

Question 13: accuracy represents...

• repeatability of a measurement
• how close a measurement is to true value
• an ideal number of measurements to make
• how poorly an instrument is operating

Answer:

B Question 14: you drive 4 km at 30 km/h and another 4 km at 50 km/h. what is average speed for 8 km trip?

• > 40 km/hr b)=40 km/h
• <40 km/h
• not enough info

Answer:

C

Question 15: the number 0.0078 has how many sig figs?

Answer:

The leading zeros are not significant. Rewriting this number in scientific notation shows that it only has two significant digits.Question 16: a ball is dropped from the top of a tall building. at the same instant, a second ball is thrown upward from the ground. when the two balls pass one another, compare magnitudes of their acceleration

Answer:

they are the same - If there is no air resistance, the accelerations for the two balls have the same magnitude and direction throughout both of their flights.Question 17: you are in the middle of afield. you walk in a line for 100 m, then turn left and walk 100 m. when you stop, u are 100 m from starting point. by how many degrees did u turn? a)90 b)120 c)30 d)180 e)impossible

Answer:

B - Three equal distances of 100 m would form an equilateral triangle, so (b) is the correct answer.Question 18: a hunter is aiming horizontally at a monkey who is in a tree. monkey falls off and hunter pulls trigger at the same time. what will happen?

Answer:

the monkey and bullet fall at the same rate due to gravity. Since both start falling at the same time and fall at the same rate, the bullet will still hit the monkey