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Eduardwww [97]
3 years ago
5

An object attached to a spring is pulled across a frictionless surface. if the spring constant is 45 n/m and the spring is stret

ched by 0.88 m when the object is accelerating at 1.5 m/s2, what is the mass of the object?
Physics
1 answer:
Shkiper50 [21]3 years ago
5 0
0.88 + 1.5 = 2.38 value
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A copper wire has a radius of 3.5 mm. When forces of a certain equal magnitude but opposite directions are applied to the ends o
denpristay [2]

Answer:

The tensile stress on the wire is 550 MPa.

Explanation:

Given;

Radius of copper wire, R = 3.5 mm

extension of the copper wire, e =  5.0×10⁻³ L

L is the original length of the copper wire,

Young's modulus for copper, Y =  11×10¹⁰Pa.

Young's modulus, Y is given as the ratio of tensile stress to tensile strain, measured in the same unit as Young's modulus.

Y =\frac{Tensile \ stress}{Tensile \ strain} \\\\Tensile \ stress = Y*Tensile \ strain\\\\But, Tensile \ strain = \frac{extension}{original \ Length} = \frac{5.0*10^{-3} L}{L} = 5.0*10^{-3}\\\\Tensile \ stress = 11*10^{10} *5.0*10^{-3} \ = 550*10^6 \ Pa

Therefore, the tensile stress on the wire is 550 MPa.

8 0
3 years ago
What is the mass number of the isotope lithium-7?
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5 0
3 years ago
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Explain why astronomers long ago believed that space must be filled with some kind of substance (the “aether”) instead of the va
professor190 [17]

Answer:Explained

Explanation:

The scientist of that time could not believe that the electromagnetic waves do not require a medium to travel through so they made a space filling substance necessary to travel of electromagnetic waves called aether.

But after the special 0 theory of relativity this idea is discarded and fell out.

6 0
3 years ago
Normally light waves move in all different directions. When light becomes P________, all of the electric fields in the waves mov
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Answer:im so sorry i cant find anything either ask your teacher for some help is the best thing i can do

4 0
3 years ago
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A 1000-kg car is moving at 40.0 km/hr when the driver slams on the brakes and skids to a stop (with locked brakes) over a distan
liq [111]

Answer:

 skid distance = 180 m  

Explanation:

given,

mass of the car = 1000 Kg

speed of the car = 40 Km/hr

distance to stop = 20 m

if speed is now = 120 Km/he

distance to stop = ?

from given question we can state that,

Work done by the friction is equal to the change in kinetic energy of the car.

       W= \dfrac{1}{2}mv^2............(1)

And we also know that work is directly proportional to displacement

               W = F × x...........................(2)

from the equation (1) and (2)

        x ∝ v²

now,

   here velocity is increased from 40 km/h to 120 km/h means velocity is increase 3 times

so displacement will be equal to 3² or 9 times

hence, skid distance will be equal to 9 x 20 = 180 m

 skid distance = 180 m  

8 0
3 years ago
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