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madreJ [45]
3 years ago
13

A drive find difficulty to drive a car when the ground is cover with ice explain why?

Physics
1 answer:
Rus_ich [418]3 years ago
7 0
The ground is less rough, so there is less friction between the ground and the wheels of the car. This makes it unable for the car to move forward
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Which of the following types of electromagnetic radiation has the lowest energy?
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(d) What type of transformation is done by the following things?
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it took 3.5 hours for a train to travel the distance between two cities at a velocity of 120 miles per hour. How many miles lie
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Given:

Time: 3.5 hrs

Velocity: 120 miles/hr

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A 72-kg skydiver is falling from 10000 feet. At an instant during the fall, the skydiver
MissTica

Answer:

Approximately 2.31\; \rm m \cdot s^{-2} (assuming that the acceleration due to gravity isg = 9.81\; \rm m \cdot s^{-2}.)

Explanation:

Assuming that g = 9.81\; \rm m \cdot s^{-2} the weight on this 72-kg skydiver would be W = m \cdot g = 72 \; \rm kg \times 9.81\; \rm m \cdot s^{-2} = 706.32\; \rm N (points downwards.)

Air resistance is supposed to act in the opposite direction of the motion. Since this skydiver is moving downwards, the air resistance on the skydiver would point upwards.

Therefore, the net force on this skydiver should be the difference between the weight and the air resistance on the skydiver:

\begin{aligned}F(\text{net force}) &= W - F(\text{air resistance})\\ &= 706.32\; \rm N - 540\; \rm N =166.32\; \rm N \end{aligned}.

Apply Newton's Second Law of motion to find the acceleration of this skydiver:

\begin{aligned}a &= \frac{F(\text{net force})}{m} \\ &= \frac{166.32\; \rm N}{72\; \rm kg} = 2.31\; \rm m \cdot s^{-2} \end{aligned}.

5 0
3 years ago
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