Which statements are part of the safety protocol for this lab experiment? Check all that apply:
✓ Always wear a lab coat and safety goggles when performing an experiment
X Use caution when freezing fluids as they may expand
✓ Use the right gear, such as tongs and thermal mitts, to handle hot objects
✓ Check glassware, such as beakers and flasks, for cracks and chips prior to use
X Ear protection should be worn to protect against the loud noises associated with heat transfer​

Answer:

A battery connected to a 140 resistor dissipates 17W of power. If the circuit contains only the battery and the resistor, what is the voltage of the battery?

Explanation:

Answer:

Explanation:

Assuming the table is horizontal

As speed is constant, friction must exactly balance the horizontal component of the applied force

Ff = 50cos30 = 43 N

The  normal force must oppose both the weight of the box and the vertical component of the applied force.

N = 10(9.8) + 50sin30 = 123 N

The frictional force can be calculated with the angle and mass of the moving body and the normal force acting on it. The normal force on the body is 98 N and the frictional force is 7.712 N.

Friction is the resistance to the movement of a body. If the motion is in a frictionless path then the body will moves in a constant speed in a straight line.

The normal force is the product of mass of the body and gravity 9.8. Then the frictional force can be calculated by the equation with of friction as follows:

Frictional force = F × cos ∅

is the angle.

Thus frictional force = 50N × cos 30

                                 = 7.712 N

The normal force F = m ×  g

                                = 10 Kg × 9.8 m/s²

                                = 98 N.

Therefore, the normal force acting on the body moving with a constant speed and constant force 50 N and horizontal angle 30 degree is 98 N and the frictional force is 7.712 N.

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Answer:

The blocks c

Explanation:

Answer:

A. Heat sink

Explanation:

Explanation:

the force to pull or push the block upwards (with the rope being parallel to the inclined plane) with 0 acceleration (moves with constant velocity) and therefore the tension on the rope is

Ft = m×g×sin(angle) + y×m×g×cos(angle)

force of gravity force of friction

down (down)

m = the mass of the object = 200kg

g = Earth's gravity acceleration = 9.8m/s²

y = the Greek letter mu, the coefficient of friction (it does not say "static" or "kinetic", I assume kinetic because the object is moving with a constant velocity, but it does not matter here) = 0.05

angle = 25 degrees

the result is N (Newton).

so, let's put the numbers into the equation and calculate :

200×9.8×sin(25) + 0.05×200×9.8×cos(25) =

≈ 828.33 N + 88.82 N ≈ 917.15 N

the closest answer option is B (936 N).

I don't know why there is this difference.

Answer: Options that describes first law of motion from the question are;

An overall net force must be applied to an object before it can move.

Newton’s first law of motion is also known as the law of inertia.

Newton’s first law applies to an object whether it is moving or not.

Newton's first law states can be regarded as law of inertia. it made us to understand that when a body is resting then it keeps the rest unless there is external force been acted on it or if the body is  moving at a constant speed, it will continue until there is external force acted.

A body will move from its resting only when net force is applied.

Example of this law is seen in when someone is sitting in a car putting on the seat belt.

This law applies to moving object as well as static object.

Therefore, option B,C and E right.

Explanation:

Answer: I would say like if  a person jumps out of a moving vehicle, he falls forward due to inertia of motion.  One example of Newton's first law in real life is, when you are walking with a glass filled with water, you will notice that the water spills at certain locations when you walk at faster pace.

Explanation:

Answer:

20 40

Explanation:

A 10 kg box initially at rest accelerates uniformly to a speed of 20 m/s in 2 seconds, energy gained by the block 2000 J and Power developed by the box at the end of 10 seconds 5000 Watt

The total amount of energy transferred when a force is applied to move an object through some distance

The work done is the multiplication of applied force with displacement.

Work Done = Force * Displacement

As given in the problem A 10 kg box initially at rest accelerates uniformly to a speed of 20 m/s in 2 seconds

By using the first equation of motion

v = u + at

20 = 0 + 2a

a = 10 m/s²

By using the third equation of motion

v² - u² = 2as

20² - 0² = 2×10×s

s = 400/20

s = 20 m

Force = ma

          = 10 ×10

          = 100 N

work done = Force × displacement

                   = 100 ×20

                   = 2000 J

Velocity after 10 seconds

V= u + at

  = 0 + 10×10

  = 100 m/s

work done after 10 seconds

= 1/2mv²

= 0.5×10×10²

=50000 J

Power = work done  / time

           = 50000/10

           = 5000 Watt

Thus, energy gained by the block 2000 J and Power developed by the box at the end of 10 seconds 5000 Watt

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Answer:

force of attraction will be increased by 9

Explanation:

force of attraction is inversely proportional to square of distance

i.e F= 1/R²

F=1/3R²

F=1/9R

9×F= 9×1/9R

9F= 1/R

so force of attraction is 9 times

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The product in a chemical reaction is written on the Right side of the arrow, so

the product formed here in given reaction is :

Answer:C) When the swing is pulled back to prior release

Explanation:

This question involves the concepts of the law of conservation of energy, gravitational potential energy, and kinetic energy.

All of the energy is gravitational potential energy at "C) when the swing is pulled back prior to release".

The law of conservation of energy states that at any point the total energy of the swing must be constant, which means:

Total Energy = Gravitational Potential Energy + Kinetic Energy = Constant

It is clear that the swing has a non-zero speed in all given situations except the situation in part C), where the swing is at rest before release. Since the kinetic energy exists due to motion in the object. Hence, the kinetic energy will be zero when the swing is pulled back prior to release. It means all the energy in the swing at this time will be the gravitational potential energy.

Learn more about the law of conservation of energy here:

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The attached picture explains the law of conservation of energy.

Answer:

Carbon atoms are made up of 6 protons, 6 electrons, and 6 neutrons, whereas Oxygen atoms are made of 8 protons, 8 neutrons, and 8 electrons.

Explanation:

This may not sound like a big difference at the atomic level, but it is responsible for all of the differences between Oxygen and Carbon.

Answer:20

Explanation:

The new planet has the radius of only 1/4th of earth and mass of half that of earth. Then , the gravity on the surface of the new planet will be8 times higher than that of earth.

The gravitational force is the force by which an object attracts other object into its center of mass. Earth attracts every objects on ots surface to the ground by gravitation.

The force of gravitation is directly proportional to the mass and inversely proportional to the distance or radius of the planet.

g =  G m/r²

Where G is the universal gravitational constant.

The new planet has the mass half of that of earth (me) and radius 1/4th of earth.

gn = G me/2 (re/4)²

  = G 16 me/2

  = 8 ge

Where ge is the gravity by earth and gn that of new planet. The gravitational force of the new planet will be 8 times greater than that of earth.

Find more on gravitational force:

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Answer:

they can't breath and they gon dead

Explanation:

yum yum yum yum yum

Answer:

the answer is in my mind but not coming in the mouth I'll tell you when I remember ''sorry ''

Answer:

p = w/t = mgh/t = 60kg*7.2m*10.4sec/10.4 = 432 watt

Answer:

Explanation:

I=Q2- Q1

And I = F. (t2-t1)

t = 0,32s

v = 8,5 m/s

Q = m.v

Q=66,5.8,5 = 565,25 kg.m/s

F. (t2-t1) = 565,25

F.0,32 = 565,25

F = 1766,4 N

Answer:

F - The skin is the body's first physical barrier, hairs in the nose filter air as it enters the body, pores in the skin release toxins and pathogens

Answer:

A

Explanation:

If we ignore air resistance or friction, the balls would hit the ground at the same time. The question does not state whether or not there is air resistance.

If there was air resistance, ball A would hit the ground first.

Again, there is no information provided on whether is is air resistance or not, so there is not enough information.

Answer:

_Sorrrrry_ I can't help u_

1cathode rays plural : the high-speed electrons emitted in a stream from the heated cathode of a vacuum tube

2: a stream of electrons emitted from the cathode of a vacuum tube —usually used in plural

#Case -1

If Pulling force is less than frictional force the object won't move .

#Case-2

If Pulling force is greater than frictional force then object will be .

In order to calculate friction force you need Limiting friction first .

[tex]\\ \sf\longmapsto F_L=\mu sN[/tex]

Answer:

Below

Explanation:

To find the velocity of the person you can use this formula

     velocity = displacement / time

     velocity = 13.09 km / 2.371 hours

     velocity = 5.5208 km/h

                   = 5.521 km/h

Hope this helps!

Answer:

-1.5 m/s/s + (3.0 s + 2.0 m/s) = -7.5 m/s/s

-7.5 m/s/s x 3.0 s × 3.0 s × 3.0 s = - 202.5