Physics, 25.01.2020 00:31 quinshayewilli3329

Later that day, martin does the same thing with josh, who is 2 times heavier than martin. if the collision is totally inelastic, what height does josh reach?

a. h/25
b. h/16
c. h/8
d. h/4
e. h/2
f. h
g. none of the above.

Answers: 3

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Answer from: rell5911

Josh reaches at $\dfrac{h}{9}$ height.

(g) is correct option

Explanation:

Given that,

Mass of martin = m

Mass of josh m'= 2m

Martin and Paul are skateboarding in a large semicircular halfpipe. Martin starts out from rest at a height h and collides with Paul standing at the bottom. Martin and Paul have about the same mass. After the collision,

We need to calculate the speed before the collision

Using conservation of energy

$mgh=\dfrac{1}{2}mv^2$

$v=\dfrac{2gh}$

We need to calculate the final speed after collision

Using conservation of momentum

$mv_{i}=(m+2m)v_{f}$

Put the value into the formula

$v_{f}=\dfrac{\sqrt{2gh}}{3}$

We need to calculate the height

Using conservation of energy

$\dfrac{1}{2}\times m\times v^2=mgH$

Put the value into the formula

$\dfrac{1}{2}\times 3m\times(\dfrac{2gh}{9})=3mgH$

$H=\dfrac{h}{9}$

Hence, Josh reaches at $\dfrac{h}{9}$ height.

Answer from: Quest

the simple machine has three main features. they are:

loadfulcrumeffort

fulcrum is the center point or pivot point of the machine. effort is input force/ applied force. load is external force/ output.

the keisha 's machine labels are

x : load

y: fulcrum

z: lever

Answer from: Quest

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

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