Which coefficient of O2 is needed to balance the equation C3H8 + O2 → 3CO2 + 4H2O?

a. 2

b. 3

c. 5

d. 6

A physicist wants to study the motion of a car. a. The physicist put 8 L of gasoline in a ca. How many gallons is this? (Note: 1 gal = 3.79 L) b. The car was able to travel 75.3 jm before it ran out of gas. How many miles is this? (Note 1 mi = 1.

There are 100 cm in every meter. If a measurement is 1.67 m, what is the measurement expressed in centimeters?

Steve hears a siren emitting a frequency of 10 kHz when it is at rest. What frequency will Steve hear if the siren moves toward him at 30 m/s? Assume the speed of sound is 340 m/s. Answer options are: a. 11 kHz b. 10 kHz c. 0 kHz d. 9 kHz

Two people push on the same door from opposite sides as shown. A man pushes on a door from the left. A woman pushes on the door from the right. They will only see the door move when both people exert the same force so that the forces are unbalanced.

Common units of measurement for speed.

Which hormones are released in girls during puberty? A. testosterone and estrogen B. testosterone and progesterone C. ingesterone and estrogen D. estrogen and progesterone

Which property makes radio waves most useful for communication? They have low frequencies. They have long wavelengths. They transfer low amounts of energy.

Describe how water may be treated before it is used by people? P. S - This is a science question.

Using the formula for kinetic energy of a moving particle k=12mv2, find the kinetic energy ka of particle a and the kinetic energy kb of particle b. remember that both particles rotate about the y axis.

boris the bear is lumbering along at a constant rate of 4.0 m/s. if he walks for 600.0 seconds, how far will he travel?