1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
andre [41]
2 years ago
10

A track star runs the first 500 meters of a race in only 75 seconds. What is the track

Physics
2 answers:
irina1246 [14]2 years ago
7 0

Answer:

6.667 m/s

Explanation:

500 meters = 75 seconds

500 meters / 75 seconds = 6.667 m/s

Kobotan [32]2 years ago
3 0
500m/75 sec = 6.6m/sec

You might be interested in
Compare and contrast the function of the thymus and spleen<br> needed asap
Helga [31]

Answer:The thymus stores and produces T lymphocytes and also releases hormones which aid in the maturation of the T lymphocytes while the spleen stores and release lymphocytes as well as macrophages which eradicate foreign substances that may harm the body.

Explanation:

6 0
2 years ago
Pls help . Which process produces the energy that is used in photosynthesis?
levacccp [35]

Answer: Nuclear fusion

Explanation:

Have great day!

:)

7 0
3 years ago
Read 2 more answers
a 2,000 pound car is driving at 60 miles/hour along a straight, level road. what is the net force acting on the car?
SVETLANKA909090 [29]

Answer:

0

Explanation:

According to Newton's second law, the net force is equal to the mass times the acceleration.  Since the car is not accelerating, the net force is 0.

5 0
3 years ago
Consider a father pushing a child on a playground merry-go-round. The system has a moment of inertia of 84.4 kg.m^2. The father
Sophie [7]

Answer:

Explanation:

Given that:

the initial angular velocity \omega_o = 0

angular acceleration \alpha = 4.44 rad/s²

Using the formula:

\omega = \omega_o+ \alpha t

Making t the subject of the formula:

t= \dfrac{\omega- \omega_o}{ \alpha }

where;

\omega = 1.53 \ rad/s^2

∴

t= \dfrac{1.53-0}{4.44 }

t = 0.345 s

b)

Using the formula:

\omega ^2 = \omega _o^2 + 2 \alpha \theta

here;

\theta = angular displacement

∴

\theta = \dfrac{\omega^2 - \omega_o^2}{2 \alpha }

\theta = \dfrac{(1.53)^2 -0^2}{2 (4.44) }

\theta =0.264 \ rad

Recall that:

2π rad = 1 revolution

Then;

0.264 rad = (x) revolution

x = \dfrac{0.264 \times 1}{2 \pi}

x = 0.042 revolutions

c)

Here; force = 270 N

radius = 1.20 m

The torque = F * r

\tau = 270 \times 1.20 \\ \\  \tau = 324 \ Nm

However;

From the moment of inertia;

Torque( \tau) = I \alpha \\ \\  Since( I \alpha) = 324 \ Nm. \\ \\  Then; \\ \\  \alpha= \dfrac{324}{I}

given that;

I = 84.4 kg.m²

\alpha= \dfrac{324}{84.4} \\ \\  \alpha=3.84 \ rad/s^2

For re-tardation; \alpha=-3.84 \ rad/s^2

Using the equation

t= \dfrac{\omega- \omega_o}{ \alpha }

t= \dfrac{0-1.53}{ -3.84 }

t= \dfrac{1.53}{ 3.84 }

t = 0.398s

The required time it takes= 0.398s

5 0
2 years ago
When an x-ray photon passes through matter it undergoes a process called:_________.
bekas [8.4K]

Answer:

when an x-ray passes trough matter, it undergoes a process called attenuation

5 0
2 years ago
Other questions:
  • Q. No. 9 A body falls freely from the top of a tower and during the last second of its fall, it falls through 25m. Find the heig
    8·1 answer
  • Which of the following has the lowest U value?
    10·1 answer
  • A 0.22 kg air track glider moving at 0.60 m/s a collides elastically into a 0.44 kg glider at rest. After collision the 0.22 kg
    14·1 answer
  • A tortoise and hare start from rest and have a race. As the race begins, both accelerate forward. The hare accelerates uniformly
    7·1 answer
  • The gravitational acceleration is 9.81 m/s2 here on Earth at sea level. What is the gravitational acceleration at a height of 35
    8·1 answer
  • The illustration shows a roller coaster and indicates four different positions the car might be at as it moves along the track.
    5·1 answer
  • Followed by the previous question: presume that the electron performs a uniform circular motion around the hydrogen nucleus. Wha
    9·1 answer
  • A boy notices that 45 complete waves travel past him in ninety seconds. What is the
    8·1 answer
  • 4. Three methods that people use are:
    11·1 answer
  • A body of mass 10kg has a height of 200cm, calculate the potential energy. (Take g =
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!