Ask question

Ask question

All categories

3 years ago

7

What is the average speed of a car that traveled 300.0 miles in 5.5 hours?

2 answers:

Pavlova-9 [17]3 years ago

7 0

<span>i think the average speed was 54.54 (mph)</span>

zysi [14]3 years ago

7 0

Average speed = (distance covered) / (time to cover the distance)

   = (300 miles) / (5.5 hours)

   = ( 300 / 5.5 ) miles/hour

   = 54.55 mph

You might be interested in

A block of unknown mass is attached to a spring with a spring constant of 7.00 N/m 2 and undergoes simple harmonic motion with a

KatRina [158]

Answers:

a) $0.80 kg$

b) $2.12 s$

c) $1.093 m/s^{2}$

Explanation:

We have the following data:

$k=7 N/m$ is the spring constant

$A=12.5 cm \frac{1 m}{100 cm}=0.125 m$ is the amplitude of oscillation

$V=32 cm/s=0.32 m/s$ is the velocity of the block when $x=\frac{A}{2}=0.0625 m$

Now let's begin with the answers:

<h3>a) Mass of the block</h3>

We can solve this by the conservation of energy principle:

$U_{o}+K_{o}=U_{f}+K_{f}$ (1)

Where:

$U_{o}=k\frac{A^{2}}{2}$ is the initial potential energy

$K_{o}=0$ is the initial kinetic energy

$U_{f}=k\frac{x^{2}}{2}$ is the final potential energy

$K_{f}=\frac{1}{2} m V^{2}$ is the final kinetic energy

Then:

$k\frac{A^{2}}{2}=k\frac{x^{2}}{2}+\frac{1}{2} m V^{2}$ (2)

Isolating $m$ :

$m=\frac{k(A^{2}-x^{2})}{V^{2}}$ (3)

$m=\frac{7 N/m((0.125 m)^{2}-(0.0625 m)^{2})}{(0.32 m/s)^{2}}$ (4)

$m=0.80 kg$ (5)

<h3>b) Period</h3>

The period $T$ is given by:

$T=2 \pi \sqrt{\frac{m}{k}}$ (6)

Substituting (5) in (6):

$T=2 \pi \sqrt{\frac{0.80 kg}{7 N/m}}$ (7)

$T=2.12 s$ (8)

<h3>c) Maximum acceleration</h3>

The maximum acceleration $a_{max}$ is when the force is maximum $F_{max}$ , as well :

$F_{max}=m.a_{max}=k.x_{max}$ (9)

Being $x_{max}=A$

Hence:

$m.a_{max}=kA$ (10)

Finding $a_{max}$ :

$a_{max}=\frac{kA}{m}$ (11)

$a_{max}=\frac{(7 N/m)(0.125 m)}{0.80 kg}$ (12)

Finally:

$a_{max}=1.093 m/s^{2}$

5 0

3 years ago

The distance a toy car travels over time is shown in the graph.

Korvikt [17]

Answer:

a toy car speed is about 2.5 to 3.5 mph

6 0

3 years ago

If chris throws a baseball 60 meters in 4 seconds, what is the average speed of the football?

IceJOKER [234]

The average speed of the football is 15 meters per second. Just divide both of the numbers by 4 :)

6 0

4 years ago

Which of the following is the best example of a good hypothesis?

Musya8 [376]

Answer:

Which of the following is the best example of a good hypothesis?

B. A cheetah can run faster than a tiger This Is A good Hypothesis Because You Can Test this With a Experiment

xXxAnimexXx

Have a great day!

4 0

3 years ago

Read 2 more answers

How long will it take to go 150,000 m traveling at 50 km/hr

Vanyuwa [196]

150 km / 50 km/h = 3h

5 0

3 years ago

Read 2 more answers