Physics, 24.08.2019 07:30 Rodrigo6379

Acar traveling with constant speed travels 150 km in 7200 s. what is the speed of the car?
express the speed to two significant figures and include the appropriate units.

Answers: 1

Show answers

Answers

Answer from: lillitzy8865

The speed of the car is 75 km/h

Further explanation

These are the formulas that we have to remember before solving the problem.

Speed is the rate of change of distance.

$\large { \boxed {v = \frac{d}{t}}}$

v = speed ( m/s )

d = distance ( m )

t = time ( s )

Acceleration is the rate of change of velocity.

$\large { \boxed {a = \frac{\Delta v}{t}}}$

a = acceleration ( m/s² )

Δv = change in speed ( m/s )

t = time ( s )

Let us now tackle the problem!

Given:

distance = d = 150 km

time taken = t = 7200 s = 2 hours

Unknown:

velocity = v = ?

Solution:

$v = \frac{d}{t}$

$v = \frac{150}{2}$

$\large {\boxed {v = 75~km/h} }$

The acceleration of the car is 0 m/s² because it travels with constant speed.

We could also plot the distance vs time graph as shown in the attachment.

Learn moreVelocity of A Runner : linkKinetic Energy : linkAcceleration : linkAnswer details

Grade: Middle School

Subject: Physics

Chapter: Kinematics

Keywords: indycar top speed of a fastest police car has ever gone

Acar traveling with constant speed travels 150 km in 7200 s. what is the speed of the car? express

Answer from: niyahdabadest

The speed of the car to 2 significant figures is $\boxed{21\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}}$ .

Further Explanation:

Given:

The distance covered by the car is $150\,{\text{km}}$ .

The time taken by the car to cover the distance is $7200\,{\text{s}}$ .

Concept:

The speed of a car defined as the ratio of the distance and the time taken by the car in covering that distance.

Write the expression for the speed of the car as:

$v = \dfrac{{{\text{distance}}}}{{{\text{time}}}}$ …… (1)

Here, is the speed of the car.

The distance covered by the car in meters is.

$\begin{aligned}d&= 150 \times {\text{1000}}\,{\text{m}}\\{\text{ 1}}&={\text{.50}} \times {\text{1}}{{\text{0}}^5}\,{\text{m}}\\\end{aligned}$

Substitute the values in the above expression.

$\begin{aligned}v&= \frac{{1.50 \times {{10}^5}\,{\text{m}}}}{{7200\,{\text{s}}}}\\&= \frac{{1500}}{{72}}\,{{\text{m}} \mathord{\left/ {\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}\\&= 20.83\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}\\&\approx 21\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}\\\end{aligned}$

Thus, the speed of the car to 2 significant figures is $\boxed{21\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}}$ .

Learn More:

A test car travels in a straight line along the x axis, the graph in the figure shows link If no friction acts on a diver during a dive, then which of the following statements is true link A 1500-kg car accelerates from rest to 25 m/s in 7.0 s. What is the average power delivered by the link

Answer Details:

Grade: Middle School

Chapter: Speed and distance

Subject: Physics

Keywords: Speed, velocity, distance, time, distance of 150 km, in 7200 s, speed of the car, ratio of distance, rate of change of distance, 20.83 m/s, 21m/s.

Answer from: Quest

Gshusgshsvsvshhdsudu

Answer from: Quest

Electoral current force mechanical advantage if the wheel and axle is 2 n and the output force is 20 n

Another question on Physics

Physics, 21.06.2019 19:00

An object is located 30.0 cm from a concave mirror. the focal length is 15.0 c,. what is the image distance? a. 30.0 cm b. -10 cm c. 10.0 cm d. -30.0 cm

Answers: 1

Answer

Physics, 22.06.2019 02:30

What are the factors that affect the resistance of a wire?

Answers: 1

Answer

Physics, 22.06.2019 05:30

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Answers: 3

Answer

Physics, 22.06.2019 10:00

**urgent** roberto plans to use two transformers to reduce a voltage of 120 v to 4 v. he uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. he has four other transformers, as listed in the table. which transformer should roberto use to have an ending voltage of 4 v? a- w b-xc- yd- z

Answers: 1

Answer

You know the right answer?

Acar traveling with constant speed travels 150 km in 7200 s. what is the speed of the car?
ex...

Questions