PHYSICS HIGH SCHOOL

A car slams on its brakes creating an acceleration of -3.2 m/s2 it comes to a rest after traveling a distance of 210 m what was it's velocity before it began to accelerate

Answers

Answer 1
Answer:

The initial velocity of the car is 36.6 m/s

Explanation:

The motion of the car is a uniformly accelerated motion (=constant acceleration), therefore we can apply suvat equations:

where

v is the final velocity

u is the initial velocity

a is the acceleration

s is the displacement

For the car in this problem, we have:

v = 0 is the final velocity (the car comes to a stop)

is the acceleration

s = 210 m is the displacement of the car

Solving for u, we find the initial velocity:

Learn more about accelerated motion:

brainly.com/question/9527152

brainly.com/question/11181826

brainly.com/question/2506873

brainly.com/question/2562700

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Which substance has the highest density at room temperature? a.hydrogenc.waterb.oxygend.they are all the same

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Water is the answer. It is a liquid at room temperature whereas hydrogen and oxygen are gases.
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The unit of measurement of force that pushes electrons through a conductor is the __________. (1pts) Question 4 - The unit of measurement of force that pushes electrons through a conductor is the __________. Select Ampere as your answer Ampere Select Volt as your answer Volt Select Ohm as your answer Ohm Select Watt as your answer Watt

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Answer:

Volt

Explanation:

According to Ohm's Law

where,

I = Current

V = Voltage

R = Resistance

The current can be thought as the total number of electrons that going through the circuit.

The resistance is the property of a condutor that resists the movement of electrons.

The voltage measures the amount of difference in potential in the circuit. The flow of electricity will only take place if there exists a difference in potential. This can be also considered as the force that pushes the electrons in the conductor.

HIGH SCHOOL

Estimate how long it would take one person to mow a football field using an ordinary home lawn mower. suppose that the mower moves with a 1-km/h speed, has a 0.5-m width, and a field is 360 ft long and 160 ft wide. 1 m = 3.281 ft.

Answers

10.7 hours Since we've been told that we have a speed of 1 km/h and a width of 0.5 meters that means that after 1 hour, we can mow a path 0.5 m wide and 1000 m long for a total area of 1000 m * 0.5 m = 500 m^2/hr. Now let's calculate the area of that football field. 360 ft / 3.281 ft/m * 160 ft / 3.281 ft/m = 5350.692864 m^2 Now let's divide that area by the 500 m^2 calculated earlier to see how many hours it will take. 5350.692864 m^2 / 500 m^2/hr = 10.70138573 hr So it would take about 10.7 hours to mow the football field.
COLLEGE

Some plants disperse their seeds when the fruit splits and contracts, propelling the seeds through the air. The trajectory of these seeds can be determined with a high-speed camera. In an experiment on one type of plant, seeds are projected at 20 cm above ground level with initial speeds between 2.3 m/s and 4.6 m/s. The launch angle is measured from the horizontal, with + 90° corresponding to an initial velocity straight up and – 90° straight down. About how long does it take a seed launched at 90° at the highest possible initial speed to reach its maximum height? Ignore air resistance. (a) 0.23 s; (b) 0.47 s; (c) 1.0 s; (d) 2.3 s.

Answers

Answer:

Biomedical engineering

Explanation:

this is because plant sees are important

HIGH SCHOOL

What type of optical device can be used to correct farsightedness? A. Any lens
B. A convex lens
C. A concave lens
D. Any convex device

Answers

Answer:

Option (B )

Explanation:

Farsighted Ness is the defect of vision in which a person is not able to see the nearby devices but can see the far off objects clearly.

In this case the rays of light focus behind the retina.

To correct this defect the person should use convex lens of suitable focal length.

Answer: A

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MIDDLE SCHOOL

Mrs. Nogaki pushes one 10 kg box of books and one 20 kg box of books across a floor with equal force. What is true of the momentum of the boxes? A. The first box has half the momentum of the second box
B. The first box has double the momentum of the second box
C. The first box has a quarter of the momentum of the second box
D. The first box has a quadruple the force of the second box
E. The boxes have the same momentum since the same force was used

Answers

Answer:

B. The first box has double the momentum of the second box.

Explanation:

The reason being that the second box is double the weight, while the first box is lighter.

Mrs. Nogaki applies the same force for both boxes but the heavier box will require more force.

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Answers

i think the answer is 9.

Have 9 protons.. fluorine atom



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