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Vikentia [17]
4 years ago
7

The magnitude of the normal force is

Physics
1 answer:
rjkz [21]4 years ago
7 0
45N
The normal is perpendicular to the forces that go up or down the slope. The downward force is just the weight .
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A cyclist accelerates from 0 m/s [S] to be 15 m/s [S] in 4 s. What is his acceleration?
kotegsom [21]
15/4 = 3.75 m/s2. Do not try this formula all the time. This is an exception
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3 years ago
A 5 kg brick is dropped from a height of 12m on a spring with a spring constant 8 kN/m. If the spring has unstretched length of
Ivan

Answer:

0.1164 m

0.49387 m

Explanation:

m = Mass = 5 kg

g = Acceleration due to gravity = 9.81 m/s²

h = Height from which brick falls = 12 m

k = Spring constant = 8 kN/m

a) Potential energy of the brick

PE=mgh\\\Rightarrow PE=5\times 9.81\times 12\\\Rightarrow PE=588.6\ J

Potential energy in spring

PE=\frac{1}{2}\times kx^2\\\Rightarrow x=\sqrt{\frac{PE\times 2}{k}}\\\Rightarrow x=\sqrt{\frac{588.6\times 2}{8000}}\\\Rightarrow x=0.3836\ m

The compression of spring = 0.5-0.3836 = 0.1164 m

b) Weight of the brick

F=5\times 9.81\\\Rightarrow F=49.05\ N

F=kx\\\Rightarrow x=\frac{F}{k}\\\Rightarrow x=\frac{49.05}{8000}\\\Rightarrow x=0.00613\ m

The final length of the spring = 0.5-0.00613 = 0.49387 m

4 0
3 years ago
Which statement best explains some consequences of early sexual activity? Consequences to early sexual activity are not importan
Artemon [7]

I'd say a from opinion but its answer is d

8 0
3 years ago
four cars are required to take a group of 16 students on a trip.If there are 36 students to transport how many cars would be nee
Luden [163]

4 cars = 16 students

? cars = 36 students

let x be the number of cars for 36 students

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It requires 9 cars for 36 students.

//Hope it helps

8 0
3 years ago
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lisabon 2012 [21]

Answer:

speed

Explanation:

The slope of a  line on any distance-time graph represents the speed of the object.

Velocity  only comes in when there is speed of the object in a particular direction.

4 0
3 years ago
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