PHYSICS HIGH SCHOOL

Ilya and Anya each can run at a speed of 8.90mph and walk at a speed of 3.80mph . They set off together on a route of length 5.00miles. Anya walks half of the distance and runs the other half, while Ilya walks half of the time and runs the other half.a)How long does it take Anya to cover the distance of 5.00miles ?
Express your answer numerically, in minutes.
b)Find Anya's average speed.
Express Anya's average speed save,Anya numerically, in miles per hour
C)How long does it take Ilya to cover the distance?
Express the time tIlya taken by Ilya numerically, in minutes.
d)Now find Ilya's average speed.
Express Ilya's average speed save,Ilya numerically, in miles per hour

Answers

Answer 1

Answer:

Answer:

Part a)

$T = 0.94 hours$

Part b)

$v_(avg) = 5.32 mph$

Part c)

$T = 0.79 h$

Part d)

$v_(avg) = 6.35 mph$

Explanation:

Speed while she is running = 8.90 mph

speed while she walk = 3.80 mph

Part a)

Anya walks half the distance

so time to walk

$t_1 = (2.5)/(3.80) = 0.66 h$

time to cover the distance while she run

$t_2 = (2.5)/(8.90) = 0.28 h$

total time to cover the distance

$T = t_1 + t_2$

$T = 0.94 hours$

Part b)

Average speed is given as

$v_(avg) = (d)/(t)$

$v_(avg) = (5.00 miles)/(0.94)$

$v_(avg) = 5.32 mph$

Part c)

Half the time Llya walks and next half the time she runs

so total distance is given as

$d = v_1(T/2) + v_2(T/2)$

so we have

$5.00 = 8.90(T/2) + 3.80(T/2)$

$T = 0.79 h$

Part d)

Average speed is given as

$v_(avg) = (d)/(t)$

$v_(avg) = (5.00 miles)/(0.79)$

$v_(avg) = 6.35 mph$

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Answers

Answer:

Explanation:

Newton's law of gravitation states that every particle of matter attracts any other particle in the universe with a force directly proportional to the product of there masses and inversely proportional to the square of the distance between them.

This law is also called universal law because it is applicable to all masses at all distances irrespective of the medium.

The mass of a stroller and the child it carries is 23.7 kg. A man pushes the stroller with a force of 142 N at an angle of 38.0° to the vertical. The stroller experiences a friction force of 24.0 N due to the brake accidentally being on. What is the stroller's acceleration forward?A. 5.99 m/s2
B. 3.90 m/s2
C. 2.68 m/s2
D. 4.98 m/s2

Answers

the horizontal resultant force applied is 142*Cos(38) which is 135.62N

24N of opposing force
therefore the total force acting on the stroller is 135.62-24=111.62N

applying the formula f=ma
where f is force
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An umbrella policy is designed to cover:A. expensive personal property.
B. additional buildings on your property.
C. property when traveling away from home.
D. major personal liability suits.

Answers

An umbrella policy is designed to cover D. MAJOR PERSONAL LIABILITY SUITS.

An umbrella insurance policy is extra liability insurance. It is designed to help protect you from major claims and lawsuits resulting to protecting your assets and future assets.

Umbrella policy provides additional liability coverage above the limits of your homeowners, auto, and boat insurance policies. When the liability of all this policies have been exhausted, the umbrella policy protection kicks in.

It also provides coverage on claims that are excluded by other policies.

An umbrella policy primarily provides higher liability coverage that kicks in when the liability on primary insurance policies (like auto, home) are exhausted. It is mainly designed for major personal liability suits rather than covering properties and their components.

The correct option is D.

An umbrella policy is a type of insurance policy, primarily designed to provide extra liability coverage above the limits of homeowners', auto, and boat insurance policies. It kicks in when the liability on these other policies has been exhausted. So, it refers to option D: major personal liability suits.

For example, if you have a car accident and the damages exceed the limit on your car insurance policy, an umbrella policy would help cover the additional costs.

It's not primarily about covering expensive personal property, additional buildings, or properties while traveling. However, remember it is a supplemental form of insurance; therefore, it spans a variety of situations, which may potentially include some cases of property damage or bodily injury claims.

Hence The correct option is D.

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A 20-kg bicycle carrying a 50-kg girl is traveling at a speed of 8 m/s. What is the kinetic energy of the girl and bicycle?

Answers

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How much force is needed to accelerate a 68 kilogram-skier at a rate of 1.2 m/sec^2?

Answers

Answer: Force = 81.6 N

Explanation:
According to Newton's Second law:
F = ma --- (1)

Where F = Force = ?
m = Mass = 68 kg
a = Acceleration = 1.2 m/s^2

Plug in the values in (1):
(1) => F = 68 * 1.2
F = 81.6 N (The force needed to accelerate the skier at a rate of 1.2 m/s^2)

Answer:

The force needed to accelerate a 68 kilogram-skier at a rate of 1.2ms2 is 81.6 Net forces

Explanation:

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Answers

advantages

1.Less flooding

2.Less erosion

3.Return of natural ecosystems

disadvantages

1. People go hungry

2. People don't get the water they want

3. People don't get the land they want for homes

Final answer:

Human activities can increase the carrying capacity of the environment but can also cause environmental degradation and potential decrease in carrying capacity.

Explanation:

Human activities can have both advantages and disadvantages in terms of reducing their impact on the environment. One advantage is that development of food production methods and high-quality shelters can increase the carrying capacity of the environment, allowing more people to live. However, these technologies can also lead to environmental degradation, such as air pollution, water contamination, habitat loss, and climate change. The negative effects of increasing carrying capacity may even outweigh the positive ones, potentially decreasing the world's carrying capacity for human beings.

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