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

explanation: in any substance/object, the particles inside it (atoms/molecules) constantly move in random directions and with random speeds (this motion is called brownian motion). as a result, the particles have some kinetic energy (which is proportional to the temperature of the substance).

explanation:

have a great day!

Answer from: Quest

get the total number of pieces of fruit and divide it by 4 to get the average. the result is the answer to the problem. 14 total number of fruits and there are 4 members. 14 divided by 4 is equals to 3.5.

Another question on Physics

Physics, 21.06.2019 16:40

An airplane flying parallel to the ground undergoes two consecutive displacements. the first is 76 km at 39.8◦ west of north, and the second is 156 km at 59.9◦ east of north. what is the magnitude of the plane’s total displacement? answer in units of km. 020 (part 2 of 2) 10.0

Answers: 1

Answer

Physics, 21.06.2019 17:00

Which type of current is produced by a wire breaking magnetic field lines and changing the polarity? a. alternating b. direct c. straight d. alternating and direct

Answers: 1

Answer

Physics, 22.06.2019 12:00

You have a resistor and a capacitor of unknown values. first, you charge the capacitor and discharge it through the resistor. by monitoring the capacitor voltage on an oscilloscope, you see that the voltage decays to half its initial value in 2.70 miss . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?

Answers: 2

Answer

Physics, 22.06.2019 12:30

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

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

Physics, 28.07.2019 18:00

Asphere of uniform density with mass 21 kg and radius 0.8 m is spinning, making one complete revolution every 0.8 s. the center of mass of the sphere...

Physics, 28.07.2019 18:00

Assume that the function x(t) represents the length of tape that has unwound as a function of time. find θ(t), the angle through which the drum will h...