If kerosene costs 130. Passi per liter, and one dollar buys 227.

what is its cost in DOLLARS per GALLON? [1.00 gallon = 3.79 liters] a. $2.17 per gallon b. $6.62 per gallon c. 15 cents per gallon d. 46 cents per gallon

Significant Figures

Which of the following has three significant figures? a. 1.00081 kg b. 8.060 x 1011 m c. 0.0500 mm d. 305.0 cm (I think the correct answer is d) Express 0.0015671 to three significant figures. a. 0.002 b. 0.0016 c. 0.00156 ...continues

The average density of blood is 1.06 x 103 kg/ m3.

If you donate a pint of blood to the Red Cross, what mass of blood have you donated, in grams? (1 pt = 1/2 L, 1 L = 1000 cm3) a. 530 g b. 0.530 g c. 5.30 x 103 g d. 5.30 x 105 g e. 5.30 g The last page of a book is numbered 764. ...continues

Distance calculation

A car travels at 40 km/h for 1 hour and 60 km/h for 2 hours. What is the average speed over this interval? 45 km/h 50 km/h 53 km/h 56 km/h 28.4 km Speed is to velocity as distance is to ________. magnitude acceleration ...continues

Calculating speed

A car slowed from 30 m/s to 20 m/s in 50. m. How long did it take for this to happen? a. 5.0 s b. 2.0 s c. 0.50 s d. insufficient information An auto with an initial velocity of 7.0 m/s accelerates at 0.71 m/s2 It travels a distance of 1.0 km while accelerating. What is ...continues

An airplane increases its speed from 100 m/s to 160 m/s,

at the average rate of 15 m/s2. How much time does it take for the complete increase in speed? a. 0.25 s b. 4.0 s c. 0.0577 s d. 17.3 s e. 8.0 s A car traveling 20 m/s is able to stop in a distance d. Assuming the same braking force, what distance does ...continues

Acceleration

An astronaut on a strange new planet finds that she can jump up to a maximum height of 27. meters when her initial upward speed is 6.0 m/s. What is the magnitude of the acceleration of gravity on the planet? a. 0.50 m/s^2 b. 0.67 m/s^2 c. 1.0 m/s^2 1. .5 m/s^2 A p ...continues

Acceleration

A car starting from rest moves with constant acceleration of 2 m/s2 for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of -2 m/s2. How far does it travel? a. 400 m b. 100 m ...continues

Acceleration

Assume that the acceleration of gravity is 10 m/s2 downward, and that all friction effects can be neglected. A ball is thrown upward at a velocity of 20 m/s. What is its velocity at t = 2 s? zero a. 10 m/s upward b. 10 m/s downward c. 20 m/s dow ...continues

practice problem for exam

A distant star has a single planet circling it in a circular orbit of radius 4.7x10^11m. The period of the planet's motion about the star is 738 days. What is the mass of the star? Answer in units of kg. Please see attached.