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3 years ago

Can someone help me with 1-2

Physics

1 answer:

ira [324]3 years ago

4 0

Can't really plot a graph here for question 1.

2a) The car speeds up from A to B. The car travels at a constant speed from B to C. The car slows down to a stop from C to D.

b) From the graph, at 10 seconds, the car is moving at 20 m/s.

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What line on a weather map indicates areas where the temperature is the same

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Question:
What line on a weather map indicates areas there the temperature is the same?

Answer:
The line that indicates where areas have the same temperature is called Isotherm Lines.

"Iso" means same, and "Thermal" means temperature.

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3 years ago

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Newton’s second law of motion addresses the relationship between what two variables that influence the force on a body?

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Newton’s Second Law concerns the generation of force based on an object’s mass and acceleration, as described by the equation F=ma.

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4 years ago

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Erica (37kg ) and Danny (49kg ) are bouncing on a trampoline. Just as Erica reaches the high point of her bounce, Danny is movin

Semmy [17]

Answer:

2.45 m/s

Explanation:

From the law of conservation of momentum,

The total momentum before the grab = Total momentum after the grab.

mu+m'u' = V(m+m')................... Equation 1

Where m = mass of Erica, m' = mass of Danny, u = initial velocity of Erica, u' = initial velocity of Danny, V = common velocity after garb

Make V the subject of the equation

V = (mu+m'u')/(m+m')............. Equation 2

Given: m = 37 kg, m' = 49 kg, u = 0 m/s(at the maximum height), u' = 4.3 m/s

Substitute into equation 2

V = (37×0+49×4.3)/(37+49)

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V = 2.45 m/s

Hence their speed just after the grab = 2.45 m/s

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3 years ago

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Aluminum has a specific heat of 0.902 J/g x oC. Two pieces of aluminum, with masses of 10 kg, cool from 400 oC to 100oC. One mas

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The heat energy lost is directly related to the shape of the object.

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An energy storage system based on a flywheel (a rotating disk) can store a maximum of 4.1 MJ when the flywheel is rotating at 14

nikklg [1K]

Incomplete question.The complete question is here

An energy storage system based on a flywheel (a rotating disk) can store a maximum of 4.1 MJ when the flywheel is rotating at 14000 revolutions per minute.What is the moment of inertia of the flywheel?

Answer:

Moment of inertia=3.82 kg.m²

Explanation:

Given data

Energy E=4.1 MJ=4.1×10⁶J

Angular speed ω= 14000 rev/min= 14000×2π/60=1465.3 rad/s

To find

Moment of Inertia

Solution

A rotating flywheel must store its energy as kinetic energy

Let I be moment of inertia of the flywheel.We Know

$E(Energy)=\frac{1}{2}Iw^{2}\\ I=\frac{2E}{w^{2} }\\ I=\frac{2(4.1*10^{6}) }{(1465.3)^{2} }\\ I=3.82 kgm^{2}$

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