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3 years ago

Question 1 and 2 and 3 physics lesson homework

Physics

1 answer:

storchak [24]3 years ago

5 0

Answer:

Jackson 2: Smart 3: Ahmed

Explanation:

square + circle = egg

oops, wrong guy

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The angle θ is slowly increased. Write an expression for the angle at which the block begins to move in terms of μs.

Reika [66]

Answer:

$tan \theta = \mu_s$

Explanation:

An object is at rest along a slope if the net force acting on it is zero. The equation of the forces along the direction parallel to the slope is:

$mg sin \theta - \mu_s R =0$ (1)

where

$mg sin \theta$ is the component of the weight parallel to the slope, with m being the mass of the object, g the acceleration of gravity, $\theta$ the angle of the slope

$\mu_s R$ is the frictional force, with $\mu_s$ being the coefficient of friction and R the normal reaction of the incline

The equation of the forces along the direction perpendicular to the slope is

$R-mg cos \theta = 0$

where

R is the normal reaction

$mg cos \theta$ is the component of the weight perpendicular to the slope

Solving for R,

$R=mg cos \theta$

And substituting into (1)

$mg sin \theta - \mu_s mg cos \theta = 0$

Re-arranging the equation,

$sin \theta = \mu_s cos \theta\\\rightarrow tan \theta = \mu_s$

This the condition at which the equilibrium holds: when the tangent of the angle becomes larger than the value of $\mu_s$ , the force of friction is no longer able to balance the component of the weight parallel to the slope, and so the object starts sliding down.

4 0

4 years ago

How many electrons, protons, and neutrons are in chlorine?

Rashid [163]

The element chlorine has 17 electrons, 17 protons and 18 neutrons....<span> In an atom there is an equal number of electrons and protons. The number of neutrons is found by subtracting the atomic number from the mass number ...

Hope it helps !!!</span>

7 0

4 years ago

I REALLY NEED HELP What is a closed physical system A.A system where matter and energy can enter, but not leave the system B.non

NNADVOKAT [17]

You probably already took this but if anyone wanted to know the answer it's D. "A system where matter and energy cannot enter or leave the system".

(I also took the quiz for it and got it correct)

4 0

3 years ago

Suppose an ideal gas is in a container 8.0 l in volume and allowed to expand by having a piston move. The final volume after the

wariber [46]

the initial condition is given as -

$p_{1}$ =33,000 pa

$v_{1}$ =8.0 litre i.e 8× $10^{-3}$ $m^{3}$

$t_{1}$ =300k

final state is given as-

$v_{2} =16 litre$ i.e16 $*10^{-3}$ $m^{3}$

$p_{2} =?$

$t_{2}$ =300k[the temperature is constant here]

here the temperature is constant.we have to calculate the final pressure

as per the Boyle's law,

$p_{1} *v_{1} =p_{2} *v_{2}$

$p_{2} =\frac{p_{1}*v_{1} }{v_{2} }$

= $\frac{8*10^{-3}*33000 }{16*10^{-3} }$

=16500 pa [ans]

7 0

3 years ago

The speedometer in a car does not measure the cars velocity because the velocity is a...

OLEGan [10]

...because velocity is a vector quantity, which means that it includes both the magnitude and the direction of motion.

The speedometer only measures the speed of the car and not its velocity. Speed is a scalar quantity, which means that it only indicates magnitude and not direction of the motion. Thus, the speedometer only shows the distance covered by the car with time (speed), but it does not indicate if the car is moving forward, backward, left or right.

7 0

4 years ago