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3 years ago

First to answer gets 100 points

Physics

2 answers:

melomori [17]3 years ago

7 0

ans is Static electricity is the movement of electrons. Electrons will move from the hair to the balloon.

lisabon 2012 [21]3 years ago

3 0

It discusses static electricity and how electrons move from hair to balloon. So the answer is B.

Static electricity is the movement of electrons. Electrons will move from the hair to the balloon.

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What would be new resistance if length of conductor is doubled and thickness is halved <br>

nignag [31]

Answer:

The new resistance comes out to be = 4 times of original resistance .

6 0

3 years ago

A vector starts at the point (0, 0) and ends at (3, 1). What is the magnitude and direction of the displacement?

Sindrei [870]

Answer:

tbh vector does not have any direction at all the answer is 0

6 0

3 years ago

A student pulls a sled of mass m = 82.0 kg with a force of F = 160N, and the force makes an angle of θ = 15 degrees with respect

Minchanka [31]

Answer:B

Explanation:

Given

mass of sledge=82 kg

Force on sledge=160 N

degree $=15^{\circ}$

force has two component sin and cos

Normal reaction $=mg-F\sin \theta$

$N=82\times 9.8-160\sin 15$

$N=803.6-41.41=762.19 N$

8 0

4 years ago

Read 2 more answers

Upon reaching a velocity of 100fps, the pilot of the airplane decides to abort the take off and applies brakes and stops the air

masha68 [24]

Answer:

5 ft/s²

Explanation:

u = Initial velocity = 100 ft/s

v = Final velocity = 0

s = Displacement = 1000 ft

a = Acceleration

From equation of motion

$v^2-u^2=2as\\\Rightarrow a=\dfrac{v^2-u^2}{2s}\\\Rightarrow a=\dfrac{0^2-100^2}{2\times 1000}\\\Rightarrow a=-5\ ft/s^2$

$1\ ft/s^2=0.3048\ m/s^2\\\Rightarrow 5\ ft/s^2=5\times 0.3048\ m/s^2=1.524\ m/s^2$

The airplane's deceleration is 5 ft/s² or 1.524 m/s²

8 0

3 years ago

A student wishes to record a 7.5-kilogram watermelon colliding with the ground. Calculate how far the watermelon must fall freel

algol [13]

Answer:

42.86m

Explanation:

The first thing we should keep in mind is that the watermelon moves with uniform acceleracion equal to gravity (9.81m / s ^ 2)

A body that moves with constant acceleration means that it moves in "a uniformly accelerated motion", which means that if the velocity is plotted with respect to time we will find a line and its slope will be the value of the acceleration, it determines how much it changes the speed with respect to time.

When performing a mathematical demonstration, it is found that the equations that define this movement are as follows.

$\frac {Vf^{2}-Vo^2}{2.g} =Y$

where

Vf=29m/s= final speed

Vo= initial speed=0m/S

g=gravity=9.81m/s^2

Y= distance traveled(m)

solving

$\frac {Vf^{2}-Vo^2}{2.g} =Y\\\frac {(29m/s)^{2}-(0m/s)^2}{2(9.8m/s^2)} =Y\\Y=42.86m\\$

the distance traveled by watermelon is 42.86m

5 0

4 years ago