Physics 1

10) You are driving home on a weekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school? A) 180 mi B) 190 mi C) 200 mi D) 210 mi

B) 190 mi

2) An object moves 15.0 m north and then 11.0 m south. Find both the distance it has traveled and the magnitude of its displacement. A) 4.0 m, 26.0 m B) 26.0 m, 4.0 m C) 26.0 m, 26.0 m D) 4.0 m, 4.0 m

B) 26.0 m, 4.0 m

8) If the velocity of an object is zero at some point, then its acceleration must also be zero at that point. A) True B) False

B) False

If a tree is 15 m tall, its height expressed in feet is x ft, where x is A) less than 15. B) greater than 15.

B) greater than 15.(ft is smaller than m)

A motorist makes a trip of 180 miles. For the first 90 miles she drives at a constant speed of 30 mph. At what constant speed must she drive the remaining distance if her average speed for the total trip is to be 40 mph? A) 45 mph B) 50 mph C) 52.5 mph D) 55 mph E) 60 mph

E) 60 mph

Solve for w: 19x+rx = -37x+w

w= x(19+r+37)

12y+d=-19y+t

y= t-d/31

Solve for y: Q(a+y)=67y+93

y=93-Qa/Q-67

A commuter backs her car out of her garage with an acceleration of 1.40 m/s2. (a) How long does it take her to reach a speed of 2.00 m/s? (b) If she then brakes to a stop in 0.800 s, what is her deceleration?

0-2/.8 = 2.5 m/s

Write out the number 7.35 × 10-5 in full with a decimal point and correct number of zeros.

0.0000735

Convert 1.2 × 10-3 to decimal notation

0.0012

What is the difference between 103.5 and 102.24 written with the correct number of significant figures?

1.3 (While subtracting, retain the least number of places to the decimal point among the quantities and round off accordingly.)

The North American and European continents are moving apart at a rate of about 3 cm/y. At this rate how long will it take them to drift 500 km farther apart than they are at present?

1.67*10^7 years

A weight lifter can bench press 171kg. How many milligrams (mg) is this?

1.71 × 10^8 mg

2.2*10^6-4.3*10^5

1.77*10^6

0.0001776 can also be expressed as

1.776 × 10^-4

Assume that an intercontinental ballistic missile goes from rest to a suborbital speed of 6.50 km/s in 60.0 s (the actual speed and time are classified). What is its average acceleration in m/s2 and in multiples of g (9.80 m/s2)?

11.05 g

**What is the sum of 1123 and 10.3 written with the correct number of significant figures?

1133

Significant Figures For 0.674 ÷ 0.74

2

A plot of land contains 5.8 acres. How many square meters does it contain? (1 acre = 43560ft^2)

2.3 × 10^4 m^2

A person on a diet loses 1.6kg in a week. How many micrograms/second are lost?

2.6 × 10^3

What is the value of π(8.104)2, written with the correct number of significant figures?

206.3 (answer must have 4 SF- same as 8.104)

What is the product of 11.24 and 1.95 written with the correct number of significant figures?

21.9

Add 3685g and 66.8kg and express your answer in milligrams (mg).

7.05 × 10^7 mg

**What is the sum of 1.53 + 2.786 + 3.3 written with the correct number of significant figures?

7.6

A water rocket can reach a speed of 75 m/s in 0.050 seconds from launch. What is its average acceleration?

75/.050= 1500m/s^2

If you run a complete loop around an outdoor track of length 400 m in 100 s, find your (a) average velocity and (b) average speed.

A) s=d/t 4m/s B) v=displacement/t 0 m/s

What is the result of 1.58 ÷ 3.793 written with the correct number of significant figures?

4.17 * 10^-1

A cheetah can accelerate from rest to a speed of 30.0 m/s in 7.00 s. What is its acceleration?

4.29 m/s^2

Express (4.3 × 10^6)^-1/2 in scientific notation.

4.8 *10^-4

8.2*10-5 + .0004

4.82 * 10^-4

Solve for x: a(5-x)=bx-8

-8-5a/-a-b

52 thousandths in SN

.052 --> 5.2*10^-2

Express the number in standard form 1.588 * 10^-1

.1588

If, in the figure, you start from the Bakery, travel to the Cafe, and then to the Art Gallery (a) what distance you have traveled? (b) what is your displacement?

(a) what distance you have traveled? 10.50 km (b) what is your displacement? 2.50 km south

3600-6.3*10^2

29.7*10^3

If, in a parallel universe, π has the value 3.14149, express π in that universe to four significant figures.

3.141

0.00325 × 10-8 cm can also be expressed in mm as

3.25 × 10^-10 mm.

The wavelength of a certain laser is 0.35 micrometers, where 1 micrometer=1 * 10^-6m. Express this wavelength in nanometers.

3.5 × 10^2 nm

Express 0.3643 in SN

3.643 *10^-1

The captain orders his starship to accelerate from rest at a rate of "1 g" (1 g = 9.8 m/s2). How many days does it take the starship to reach 10% the speed of light? (Light travels at 3.0 × 108 m/s.)

35.4 days

What is 34 + (3) × (1.2465) written with the correct number of significant figures?

38

The number 0.003010 has

4 significant figures.

24) The shortest wavelength of visible light is approximately 400 nm. Express this wavelength in centimeters.

4 × 10^-5 cm

-6x-1+5x^2=8x^2

6+-√24/-6

A certain CD-ROM disk can store approximately 6.0 × 10^2 megabytes of information, where 10^6 bytes = 1 megabyte. If an average word requires 9.0 bytes of storage, how many words can be stored on one disk?

6.7 × 10^7 words

What is 56 + (32.00)/(1.2465 + 3.45) written with the correct number of significant figures?

63

Land west of the San Andreas fault in southern California is moving at an average velocity of about 6 cm/y northwest relative to land east of the fault. Los Angeles is west of the fault and may thus someday be at the same latitude as San Francisco, which is east of the fault. How far in the future will this occur if the displacement to be made is 590 km northwest, assuming the motion remains constant? t=d/r

9.83*10^6 years

A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, and then 1.0 km north to return to its starting point. This trip takes 45 min. What was the bear's average velocity? A) 0.00 km/h B) 0.067 km/h C) 4.0 km/h D) 5.3 km/h

A) 0.00 km/h

What is 0.205^2/3, expressed to the proper number of significant figures? A) 0.348 B) 0.35 C) 0.3 D) 0.3477

A) 0.348 (3SF)

How many nanoseconds does it take for a computer to perform one calculation if it performs 6.7 *10^7 calculations per second? A) 15 ns B) 67 ns C) 11 ns D) 65 ns

A) 15 ns

In addition to 1 m = 39.37 in., the following exact conversion equivalents are given: 1 mile=5280 ft, 1 ft = 12 in, 1 hour=60 min. and 1 min = 60 s. If a particle has a velocity of 8.4 miles per hour, its velocity, in m/s, is closest to A) 3.8 m/s. B) 3.0 m/s. C) 3.4 m/s. D) 4.1 m/s. E) 4.5 m/s.

A) 3.8 m/s.

If a woman weighs 125 lb, her mass expressed in kilograms is x kg, where x is A) less than 125. B) greater than 125.

A) less than 125. (bc 1kg = 2.2lbs)

The following exact conversion equivalents are given: 1 m = 100 cm , 1 in = 2.54 cm, and 1ft =12in. If a computer screen has an area of 1.27 ft^2, this area is closest to A) 0.00284 . B) 0.0465 . C) 0.118 . D) 0.284 . E) 4.65 .

C) 0.118 .

A car is traveling 17.7 m/s north at After 12 s its velocity is 14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration. A) 0.30 m/s2, south B) 2.7 m/s2, south C) 0.30 m/s2, north D) 2.7 m/s2, north

C) 0.30 m/s2, north

28) A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 ms. What is the average acceleration of the ball during the collision with the wall? A) 0 m/s2 B) 200 m/s2 C) 2800 m/s2 D) 1500 m/s2 E) 1300 m/s2

C) 2800 m/s2

A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What was the average speed of the runner in m/s? A) 14,200 m/s B) 124 m/s C) 3.95 m/s D) 14.2 m/s

C) 3.95 m/s

A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, and then 1.0 km north to return to its starting point. This trip takes 45 min. What was the bear's average speed? A) 0.00 km/h B) 0.067 km/h C) 4.0 km/h D) 5.3 km/h

C) 4.0 km/h

An airplane increases its speed at the average rate of 15 m/s2. How much time does it take to increase its speed from 100 m/s to 160 m/s? A) 17 s B) 0.058 s C) 4.0 s D) 0.25 s

C) 4.0 s

A light-year is the distance that light travels in one year. The speed of light is 3.00 × 10^8 m/s. How many miles are there in one light-year? (1 mi = 1609 m, 1 y = 365 d) A) 9.46 × 1012 mi B) 9.46 × 1015 mi C) 5.88 × 1012 mi D) 5.88 × 1015 mi

C) 5.88 × 10^12 mi

3) What must be your average speed in order to travel 350 km in 5.15 h? A) 66.0 km/h B) 67.0 km/h C) 68.0 km/h D) 69.0 km/h s=d/t

C) 68.0 km/h

A racing car accelerates uniformly from rest along a straight track. This track has markers spaced at equal distances along it from the start, as shown in the figure. The car reaches a speed of 140 km/h as it passes marker 2. Where on the track was the car when it was traveling at half this speed, that is at 70 km/h? A) Before marker 1 B) At marker 1 C) Between marker 1 and marker 2

C) Between marker 1 and marker 2

7) You drive 6.0 km at 50 km/h and then another 6.0 km at 90 km/h. Your average speed over the 12 km drive will be A) greater than 70 km/h. B) equal to 70 km/h. C) less than 70 km/h. D) exactly 38 km/h.

C) less than 70 km/h.

When is the average velocity of an object equal to the instantaneous velocity? A) only when the velocity is increasing at a constant rate B) only when the velocity is decreasing at a constant rate C) when the velocity is constant D) always E) never

C) when the velocity is constant

If you are driving 72 km/h along a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive period? A) 18 m B) 20 m C) 40 m D) 80 m

D) 80 m

(a) Calculate Earth's average speed relative to the Sun. (b) What is its average velocity over a period of one year?

a) 2.99 * 10^4 b) 0m/s

Dr. John Paul Stapp was U.S. Air Force officer who studied the effects of extreme deceleration on the human body. On December 10, 1954, Stapp rode a rocket sled, accelerating from rest to a top speed of 282 m/s (1015 km/h) in 5.00 s, and was brought jarringly back to rest in only 1.40 s! Calculate his (a) acceleration and (b) deceleration. Express each in multiples of g (9.80 m/s2) by taking its ratio to the acceleration of gravity.

a) 5.76 g b) -20.6 g

A helicopter blade spins at exactly 100 revolutions per minute. Its tip is 5.00 m from the center of rotation. (a) Calculate the average speed of the blade tip in the helicopter's frame of reference. (b) What is its average velocity over one revolution?

a) 52.4 m/s b) 0 m/s