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4 years ago

What do you think car designers do if the damage caused by a crash test is too severe?

1 answer:

7 0

Car designers will more than likely go back to the lab and change certain aspects of the car (Thickness of body, design of the vehicle's frame, etc.), thus making it more durable.

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What is direct result of having greenhouse gases in the atmosphere?

11111nata11111 [884]

Earths atmosphere heats up polars melt

4 0

4 years ago

If an object is related from top of 200m high building find its velocity and time when it hits the ground.(g=(10m/s^2)

Leto [7]

Answer:

The velocity at the ground is <u>63.25 m/s</u> and time taken is <u>6.325 s.</u>

Explanation:

Given:

As the object is released, the initial velocity is, $u=0\ ms^{-1}$

Displacement of the object is, $d=200\ m$

To find:

Velocity at the bottom, $v=?$

Time to reach the bottom, $t=?$

The acceleration of the object is due to gravity and hence equal to $a=g=10\ m/s^2$

Now, using the following equation of motion:

$v^2=u^2+2ad\\v^2=0+2(10)(200)\\v^2=4000\\\textrm{Taking square root both sides}\\v=\sqrt{4000}=63.25\ m/s$

Now, using the equation of motion relating time and velocity:

$v=u+at\\63.25=0+10t\\t=\frac{63.25}{10}=6.325\ s$

Therefore, the velocity at the ground is 63.25 m/s and time taken is 6.325 s.

4 0

4 years ago

If data is biased, the data is faulty. It might be partially correct , but it is not scientifically accurate.

saw5 [17]

Hi,
I think that’s true.

8 0

3 years ago

Read 2 more answers

The terminal velocity of a person falling in air depends upon the weight and the area of the person facing the fluid. Find the t

AVprozaik [17]

Answer:

v=115 m/s

v=414 km/h

Explanation:

Given data

$A_{area}=0.140m^{2}\\ p_{air}=1.21 kg/m^{3}\\ m_{mass}=80kg$

To find

Terminal velocity (in meters per second and kilometers per hour)

Solution

At terminal speed the weight equal the drag force

$mg=1/2*C*p_{air}*v^{2}*A_{area}\\ v=\sqrt{\frac{2*m*g}{C**p_{air}*A_{area}} }\\ Where C=0.7\\v=\sqrt{\frac{2*9.8*80}{1.21*0.14*0.7} }\\ v=115m/s$

For speed in km/h(kilometers per hour)

To convert m/s to km/h you need to multiply the speed value by 3.6

$v=(115*3.6)km/h\\v=414km/h$

5 0

3 years ago

In the fastest measured tennis serve, the ball left the racquet at 73.14 m/s . A served tennis ball is typically in contact with

Dominik [7]

Answer:

2.286 km/s²

Explanation:

Since acceleration a = (v - u)/t where u = initial horizontal velocity of ball = 0 m/s (since it starts from rest), v = final horizontal velocity of ball at serve = 73.14 m/s and t = time taken for serve = 32.0 ms = 0.032 s

Substituting the values of the variables into the equation, we have

a = (v - u)/t

a = (73.14 m/s - 0 m/s)/0.032 s

a = 73.14 m/s/0.032 s

a = 2285.625 m/s²

a = 2.285625 km/s²

a ≅ 2.286 km/s²

So, the x - component of the ball's acceleration during the serve is 2.286 km/s²

5 0

3 years ago