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Tatiana [17]
3 years ago
12

An automobile traveling 50km/hr. It decelerates at 5 meter per second square. How long will it take to stop the car? How far wil

l the car travel after a brakes applied?
Physics
1 answer:
const2013 [10]3 years ago
3 0
We know, a = v/t
Here, a = 5 m/s²
v = 50 km/h= 13.88 m/s

Substitute their values into the expression:
5 = 13.88 / t
t = 13.88/5
t = 2.78 sec

Now, we know, v = d/t
13.88 = d/2.78
d = 13.88 * 2.78
d = 38.53 meter

In short, Your Answers would be:
i) It will take 2.78 sec
ii) It will travel for 38.53 m after a brakes applied.

Hope this helps!
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To heat the house, the boiler transfers 15 MJ of energy in 10 minutes.
Harrizon [31]

The formula is P = E/t, where P means power in watts, E means energy j , and t means time in seconds. This formula states that power is the consumption of energy per unit of time.

P = 15 M / 10*60

M = mega = 10⁶

15 *10⁶ / 600

= 25000 watt

8 0
2 years ago
A 7.0 kg bowling ball has a moment of inertia of 2.8x10-2 kg m2, and a radius of 0.10 m. If it rolls down the lane at an angular
slega [8]

Hi there!

Angular momentum is equivalent to:

\large\boxed{L = I\omega}

L = angular momentum (kgm²/s)

I = moment of inertia (kgm²)

ω = angular velocity (rad/sec)

Plug in the given values for moment of inertia and angular speed:

L = (0.028)(40) = \boxed{1.12 kgm^2/s}

8 0
2 years ago
A medical ultrasound imaging system sends out a steady stream of very short pulses. To simplify analysis, the reflection of one
arlik [135]

Answer:

Minimum time = 1.95x10^-4 s

Number of pulses = 5128.21 pulses/s

Explanation:

We have the speed of sound waves through human tissue with a value of 1540 m/s, to calculate the time it takes for the pulse to travel a distance of 30 cm (since the pulse will first travel a distance of 15 cm and then it will return another 15 cm to be detected by the equipment), therefore, the time between the two pulses will be equal to:

tminimum = 0.30 m/1540 m/s = 1.95x10^-4 s

To calculate the number of pulses, one second must be divided over the minimum time between the two pulses, as follows:

npulses = 1 s/1.95x10^-4 s = 5128.21 pulses/s

5 0
3 years ago
A 60.-kilogram physics student would weigh 1560
rosijanka [135]

Answer:

26m/s²

Explanation:

Given parameters:

Mass of the student  = 60kg

Weight  = 1560N

Unknown:

Acceleration due to gravity  = ?

Solution:

Weight is a force on a body due to gravity;

  Weight  = mass x gravity

   

Insert the given parameters and solve;

    1560  = 60 x gravity

    Gravity  = \frac{1560}{60}   = 26m/s²

4 0
3 years ago
A physical quantity that is described as a measure of the resistance of a body to a change in motion is called. .​
kifflom [539]

Answer:

The mass is the resistance to the acceleration of a moving object.

Explanation:

hope it helps

7 0
3 years ago
Read 2 more answers
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