PHYSICS HIGH SCHOOL

You are driving a 4000 kg pickup truck on a cold winter day when the coefficient of static friction for tires on the icy road is only 0.13. What is fastest you can drive around a bend whose radius of curvature is 50 m?

Answers

Answer 1

Answer:

Answer:

8 m/s

Explanation:

$m$ = mass of the pickup truck = 4000 kg

$\mu_(s)$ = Coefficient of static friction between tires and ice road = 0.13

$r$ = Radius of curvature = 50 m

The frictional force between tires and ice road provides the necessary centripetal force to move in circle. hence

centripetal force = frictional force

$(mv^(2))/(r) = \mu_(s) mg\n(v^(2))/(r) = \mu_(s) g\n(v^(2))/(50) = (0.13) (9.8)\nv^(2) = (0.13) (9.8) (50)\nv = 8 ms^(-1)$

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At a constant temperature, what will happen to the pressure inside a container of gas if the volume of the container is reduced?a. The pressure will increase.
b. The pressure will decrease.
c. The pressure will remain constant.

Answers

A. Because its now a smaller container with the same amount of gas

A current of 2.0A flows through a light bulb. What is the amount of charge flowing through the light bulb in 40 seconds?

Answers

Answer:

Quantity of charge = 80 Coulombs

Explanation:

Given the following data;

Current = 2 A

Time = 40 seconds

To find the amount of charge flowing through the light bulb;

Mathematically, the quantity of charge passing through a conductor is given by the formula;

Quantity of charge = current * time

Substituting into the formula, we have;

Quantity of charge = 2 * 40

Quantity of charge = 80 Coulombs

Fluids only exert pressure downward. true or false

Answers

False it goes all directions. Hope this helped.

A 360-N child is in a swing that is attached to a pair of ropes 1.90 m long. Find the gravitational potential energy of the child–Earth system relative to the child's lowest position at the following times.

Answers

Answer:

684J

Explanation:

So basically the formula for gravitational potential energy is Mass X Gravity X height. That is G.p.e = mgh

We don't have the mass but since we have the height, we multiply directly with the height since the quantity of weight is already given.

so G.p.e = 360 X 1.9 = 684J

Note that; The answer is in joules because g.p.e is work done.

Hope that was helpful!!

Fossil fuels currently account for the majority of the world’s energy use because they are A. distributed evenly throughout the world. B. nonpolluting. C. renewable energy resources. D. relatively inexpensive and readily available

Answers

Answer: D. relatively inexpensive and readily available

Fossil fuels are non-renewable sources of energy these resources formed by the geological processes occurring in the earth. It takes millions of years for their formation. These includes coal, petroleum, and natural gas. Unfortunately, the distribution of these resources is not even in the regions of the world but efforts have been done by the humans to make them available everywhere. They are relatively inexpensive and readily available this contributes to the majority of the world's energy use.

Fossil fuels currently account for the majority of the world’s energy use because they are relatively inexpensive and readily available.

In short, Your Answer would be Option D

Hope this helps!

How to find initial velocity

Answers

Answer:

Velocity= Distance divided by time divided by degree or direction.

Explanation:

Speed=DIstance divided by time

1.Initial Velocity Formula Questions:
2.Answer: The initial velocity can be found using the formula:
3.vi = vf - at.
4.Answer: The initial velocity can be found using the formula:
5.vi = vf - at.

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