Change a speed of 72.4 miles per hour to its equivalent in meters per second.
1 answer:
Answer:
Speed in meter/sec will be 32.1777 m /sec
Explanation:
We have given speed = 72.4 miles per hour
We have to convert this speed in meter per second
We know that 1 miles = 1.6 km
So 72.4 miles = 72.4×1.6= 115.84 km
We also know that 1 km = 1000 m
So 115.84 km
We know that 1 hour = 60×60 = 3600 sec
So
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Answer:
<em>The force required is 3,104 N</em>
Explanation:
<u>Force</u>
According to the second Newton's law, the net force exerted by an external agent on an object of mass m is:
F = ma
Where a is the acceleration of the object.
On the other hand, the equations of the Kinematics describe the motion of the object by the equation:
Where:
vf is the final speed
vo is the initial speed
a is the acceleration
t is the time
Solving for a:
We are given the initial speed as vo=20.4 m/s, the final speed as vf=0 (at rest), and the time taken to stop the car as t=7.4 s. The acceleration is:
The acceleration is negative because the car is braking (losing speed). Now compute the force exerted on the car of mass m=1,126 kg:
F= 3,104 N
The force required is 3,104 N