But when the force of the load on the tire is quite large(most likely several times the weight of the car) and is directed forward, then, the car is at high speed.

6 0

3 years ago

The rate at which work is done is also the definition of which of the following?

gregori [183]

B) Power
Because Power= Work/time

7 0

3 years ago

A high-speed ""bullet"" train accelerates and decelerates at the rate 4 ft/s 2 . Its maximum cruising speed is 90 mi/hr. (a) Wha

NemiM [27]

Answer:

23 mi

Explanation:

Let us first record all the values we have

acceleration = 4 ft/s

max speed = 90 mi/hr * 1 hr/3600s * 5280 ft/1 mi = 132 ft/s

We can use the equation of linear motion since acceleration is constant

distance covered = distance during acceleration + distance during costant

velocity

$s = \frac{v_{f} ^{2} - v_{i} ^{2} }{2a} + v_{i}t\\\\s = \frac{132 ^{2} - 0^{2} }{2*4} + 132*900\\s = 120 978ft$

distance in miles = 120 978 ft * 1 mi/5280 ft = 22.9125 mi ≈ 23 mi

4 0

3 years ago