General Physics I (PHY 1123) Exam #1 Key

Flashcards for General Physics I Exam #1 review.

The base SI unit of time is

Second

The resultant of two vectors is the smallest when the angle between them is

180°

Average speed to travel 350 km in 5.15 h

68.0 km/hr

Miles in a light year

5.88 x 10^12 mi

Conversion factor between km/h^2 and m/s^2

7.72 x 10^-4 m/s^2

Y component of a vector with magnitude 8.0 m at an angle of 30 degrees below the +x axis

-4.0 m

Time it takes for an airplane to increase its speed from 100 m/s to 160 m/s at an average rate of 15 m/s^2

4.0 s

The number of significant figures in 10001

Five

Velocity of a car after traveling at 15 m/s for 10 s and then speeding up with a constant acceleration of 2.0 m/s^2 for 15 s

45 m/s

The cosine of 55°

0.57

0.00045 in scientific notation

4.5 x 10^-4

Average acceleration of a car that goes from 40 m/s to 80 m/s in a distance of 200 m

12 m/s^2

Vertical component of the velocity of a ball thrown with a velocity of 25 m/s at an angle of 37° above the horizontal

15 m/s

Meters in 7.00 yd (1 inch = 2.54 cm, and 1 yd = 36 in.)

6.40 m

Maximum height reached by an object thrown upward with a speed of 12 m/s on the surface of Planet X where the acceleration due to gravity is 1.5 m/s^2

48 m

Equivalent of 50 mi/h in m/s (1 mi = 1609 m)

22 m/s

Velocity of a ball thrown upward at a velocity of 19.6 m/s after 3.00 s

9.8 m/s downward

Dimensions of A, B, and C in the equation x = A + Bt + Ct^2

distance, distance/time, distance/time^2

Initial speed of a bullet shot straight up that returns to its starting point in 10 s

49 m/s

The metric prefix for one thousand

Kilo