PHYSICS
HIGH SCHOOL

Answer:

A) The elastic potential energy stored in the spring when it is compressed 0.10 m is 0.25 J.

B) The maximum speed of the plastic sphere will be 2.2 m/s

Computation of the elastic potential energy & maximum speed. :A) The elastic potential energy should be

Here

k = spring constant.

x = compressing distance

So,

EPE = 0.25 J

b. Now the maximum speed should be

Here

m = mass of the sphere.

v = velocity

So,

v = 2.2 m/s

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Answer:

Answer:

A) The elastic potential energy stored in the spring when it is compressed 0.10 m is 0.25 J.

B) The maximum speed of the plastic sphere will be 2.2 m/s

Explanation:

Hi there!

I´ve found the complete problem on the web:

A toy launcher that is used to launch small plastic spheres horizontally contains a spring with a spring constant of 50. newtons per meter. The spring is compressed a distance of 0.10 meter when the launcher is ready to launch a plastic sphere.

A) Determine the elastic potential energy stored in the spring when the launcher is ready to launch a plastic sphere.

B) The spring is released and a 0.10-kilogram plastic sphere is fired from the launcher. Calculate the maximum speed with which the plastic sphere will be launched. [Neglect friction.] [Show all work, including the equation and substitution with units.]

A) The elastic potential energy (EPE) is calculated as follows:

EPE = 1/2 · k · x²

Where:

k = spring constant.

x = compressing distance

EPE = 1/2 · 50 N/m · (0.10 m)²

EPE = 0.25 J

The elastic potential energy stored in the spring when it is compressed 0.10 m is 0.25 J.

B) Since there is no friction, all the stored potential energy will be converted into kinetic energy when the spring is released. The equation of kinetic energy (KE) is the following:

KE = 1/2 · m · v²

Where:

m = mass of the sphere.

v = velocity

The kinetic energy of the sphere will be equal to the initial elastic potential energy:

KE = EPE = 1/2 · m · v²

0.25 J = 1/2 · 0.10 kg · v²

2 · 0.25 J / 0.10 kg = v²

v = 2.2 m/s

The maximum speed of the plastic sphere will be 2.2 m/s

MIDDLE SCHOOL

Air flows upward in the wick of a lantern because of the liquid property called

Adhesive.

Adhesive is the force of attraction between molecules of different kind. Liquid flows upward the wick because the adhesive force between the wick and the liquid is higher than cohesive forces in the liquid.

When the adhesive force between the wick and the liquid is high we have capillarity taking place. This cause the liquid to move up the wick.

MIDDLE SCHOOL

Difference between emitter and absorbers

An emitter allows things to pass through a surface from inside to outside.

An absorber allows something to pass through it from the outside to the inside.

Answer/Explanation:

Shiny surfaces are poor absorbers and emitters (but they are good reflectors of infrared radiation). If two objects made from the same material have identical volumes, a thin, flat object will radiate heat energy faster than a fat object. This is one reason why domestic radiators are thin and flat.

MIDDLE SCHOOL

Which simple machines is NOT a wedge?

I'm assuming by the phrasing of your question that you are looking for examples of simple machines that are not wedges.

Well, there are five other simple machines. There is a pulley, lever, screw, wheel and axle, and an inclined plane.

Hope that helped you!

Well, there are five other simple machines. There is a pulley, lever, screw, wheel and axle, and an inclined plane.

Hope that helped you!

MIDDLE SCHOOL

A star system in which one star blocks the light from another is call

It is called an eclipsing binary.

COLLEGE

A step-up transformer has 22 turns on the primary coil and 800 turns on the secondary coil. If this transformer is to produce an output of 5300 V with a 16- mA current, what input current and voltage are needed?

Answer:

581.82 mA

145.75 V

Explanation:

N = Number of turns

I = Current

V = Voltage

p denotes primary (input)

s denotes secondary (output)

In a transformer the following relation is applied

The input current is 581.82 mA

The input voltage is 145.75 V

Answer:

Explanation:

Given:

No. of turns in the primary coil,

No. of turns in the secondary coil,

output voltage of the transformer,

output current of the transformer,

from the equation of transformer we have:

where:

= primary current on the input side

Also

where:

input voltage on the primary coil

HIGH SCHOOL

A helicopter’s speed increases from 25 m/sec to 60 m/sec in 5 seconds. What is the acceleration of this helicopter?

It increases by 60-25=35 m/s. Divide that by the time (5 seconds) to get

Answer:

7 m/s^2

Explanation:

Acceleration = Vf - Vi / t, where Vf is the final velocity, Vi is the initial velocity, and t is the time. It is given that the helicopter’s speed increases from 25 m/s to 60 m/s in 5 s, so Vf = 60 m/s, Vi = 25 m/s, and t = 5. When putting this into the equation you get 60 - 25 / 5 which can simplify to 35 /5 also known as 7 m/s^2.

MIDDLE SCHOOL

An object pulled to the right by two forces has an acceleration of 2.5m/s2. The free-body diagram shows the forces acting on the object. What is the weight of the object?

Answer:

Weight = 490 N

Explanation:

The two forces labeled and are the force of gravity and the normal force that the surface acts upon the object. These are equal and in opposite directions cancelling each other. The other two forces and are both pointing to the right, and therefore add up to give a net force of: 50 N + 75 N = 125 N pointing to the right. Since the net acceleration of the object is given as 2.5 , we can use it in Newton's equation for the net force on an object to solve for the object's mass: Notice that since all units are in the SI system, the mass comes directly in kilograms (unit of mass in the SI system) Now, to find the weight of the object, we multiply its mass times the acceleration of gravity (9.8 ): Weight = Again, since all quantities are expressed in SI units, the weight (a force) will come out in units of "Newtons" (N)

MIDDLE SCHOOL

Why do different substances have different melting and boiling points?

Because the atoms and molecules all have different properties

MIDDLE SCHOOL

Two students made the following statements to describe atmospheric conditions at a location. Student X: The tropics are wet and warm. Student Y: A hailstorm warning has been issued. Which of these is true about the two statements?

A They both described climate.

B They both described weather.

C Student X described climate and Student Y described weather.

D Student X described weather and Student Y described climate.

The correct answer is C

Answer:

the answer is C

Explanation:

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