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3 years ago

What do the key results indicate? ED 2020 The density with balls

Physics

1 answer:

IrinaVladis [17]3 years ago

5 0

Key Results are the measures and milestones that indicate how you know you will accomplish our Objective.

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Suppose a NASCAR race car rounds one end of the Martinsville Speedway. This end of the track is a turn with a radius of approxim

Schach [20]

Complete Question

Suppose a NASCAR race car rounds one end of the Martinsville Speedway. This end of the track is a turn with a radius of approximately 57.0 m . If the track is completely flat and the race car is traveling at a constant 30.5 m/s (about 68 mph ) around the turn.

Required:

a. What is the race car's centripetal (radial) acceleration?

b. What is the force responsible for the centripetal acceleration in this case?

O normal

O gravity

O friction

O weight

Answer:

question a

$a = 16.32 \ m/s^2$

question b

correct option is option 3

Explanation:

From the question we are told that

The radius is $r = 57.0 \ m \$

The constant speed at which the race car is travelling is $v = 30 .5 \ m/s$

Generally from the question we are told that the track is completely flat so the only force pulling the car to the middle is the frictional force hence the centripetal force is due to the frictional force

Generally the centripetal acceleration is mathematically represented as

$a = \frac{v^2}{r}$

=> $a = \frac{30.5^2}{ 57}$

=> $a = 16.32 \ m/s^2$

6 0

3 years ago

3. If a certain quantity of gas has a volume of 30 cm3 at a pressure of 1 × 105 Pa, what is its volume when the pressure is

arlik [135]

We know that:

$P_{1}V_{1}= P_{2}V_{2}$ .......(1)

Given at $P_{1}=30cm^3$ , $V_{1}=10^5Pa$

When $P_{2}=2*10^5Pa$ , $V_2=$ ?

Using equation (1)

$30*10^5=2*10^5*V_2$

$V_2=30/2=15cm^3$

When $P_2=5*10^5Pa$ , $V_2=?$

using equation (1)

$30*10^5=5*10^5*V_2$

$V_2=30/5=6cm^3$

5 0

3 years ago

If the time of the impact in a collision is extended by 4 times ,how much does the force of impact change

Rama09 [41]

We know, I = F.Δt
As Δt is increased to 4 times, then, F would decrease to 4 times, in order to keep that impulse constant.

In short, Your force will change to 1/4th of it's initial value

Hope this helps!

7 0

3 years ago

10. Which of these devices is also referred to as a'key'?

brilliants [131]

Answer:

Electric switch is commonly known as the key of an electric circuit.

3 0

3 years ago

Read 2 more answers

Through which one of the following mediums is the velocity of a sound wave the greatest?

Colt1911 [192]

Answer: C. Steel

Explanation: When a sound wave travels through a solid body consisting

of an elastic material, the velocity of the wave is relatively

high. For instance, the velocity of a sound wave traveling

through steel (which is almost perfectly elastic) is about

5,060 meters per second. On the other hand, the velocity

of a sound wave traveling through an inelastic solid is

relatively low. So, for example, the velocity of a sound wave

traveling through lead (which is inelastic) is approximately

1,402 meters per second.

6 0

3 years ago