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ICE Princess25 [194]
3 years ago
8

Larry drives 20.0 km to the east from his house then 20.0 km west back to his house, takes 5.0 mins to find his wallet and leave

s again. Larry is 40.0 km east of his house 60.0 mins after he left the first time.
A) what is his avg. velocity?

B) what is his avg. speed?
Physics
1 answer:
Scorpion4ik [409]3 years ago
4 0

Larry's average speed is 
                                       (total distance) / (total time).

                      Speed = (80 km) / (60 min) = 80 km/hr .


Larry's average velocity is  
                                         (distance between start- and end- points),
                                  in the direction from the start-point to the end-point.

                       Velocity = (40 km east) / (60 min) = 40 km/hr east .

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calculate the distance a plane flies on a 7.95 hour flight from Chicago to London. Assume a constant speed of 800.0 km/h
soldier1979 [14.2K]

Answer:

6360 km

Explanation:

Use the kinematics equation x=v_ot+\frac{1}{2}at^2.  We are given t = 7.95 hours and a = 0 m/s^2 (constant speed means there is no acceleration).  Solve for x.

x=(800)(7.95)+\frac{1}{2}(0)(7.95^2)\\x=6360 \ km

4 0
3 years ago
A 60 W lightbulb is on for 24 hours. A stereo with a power of 150 W is on for 2
Helen [10]

Answer:

B) The lightbulb uses 4,104,000 J more than the stereo.

6 0
3 years ago
An airplane accelerates down a runmway at 2.9 m/s/s for 38.5 seconds
Serhud [2]

Given,

the initial velocity = 0 m /s.

acceleration = 3.20 m / s^2

time = 32.8 s

According to laws of motion.

s = ut + 1/2 at ^2

s = 1/2 at²

s=1/2(3.20)(32.8)²

s= 1721.344 m

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8 0
2 years ago
Read 2 more answers
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Mila [183]

Answer:

F = 2(50 N) - (50 N) = 50 N

Explanation:

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3 0
2 years ago
To a good approximate, the only external force that does work on a cyclist moving on level ground is the force of air resistance
mart [117]

Answer:

a. 120 W

b. 28.8 N

Explanation:

To a good approximate, the only external force that does work on a cyclist moving on level ground is the force of air resistance. Suppose a cyclist is traveling at 15 km/h on level ground. Assume he is using 480 W of metabolic power.

a. Estimate the amount of power he uses for forward motion.

b. How much force must he exert to overcome the force of air resistance?

(a) He is 25% efficient, therefore the cyclist will be expending 25% of his power to drive the bicycle forward

Power = efficiency X metabolic power

= 0.25 X 480

= 120 W

(b)

power if force times the velocity

P = Fv

convert  15 km/h to m/s

v = 15 kmph = 4.166 m/s

F = P/v

= 120/4.166

= 28.8 N

definition of terms

power is the rate at which work is done

force is that which changes a body's state of rest or uniform motion in a straight line

velocity is the change in displacement per unit time.

3 0
3 years ago
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