8. What is the kinetic energy of a car that has a mass of 1000 kg and is moving at a speed of 30 m/s?

Answer:

The length of chain she is allowed is 1.169 ft

Explanation:

The given parameters are;

The linear density of the chain = 0.83 lb/ft

The weight limit of the chain she wants = 1.4 lb

The formula for linear density = Weight/length

Therefore, in order to keep the chain below 1.4 lb, we have;

Linear density = Weight/length

Therefore;

The maximum length she wants = Weight/(Linear density)

Which gives;

The maximum length she wants = 1.4 lb/(0.83 lb/ft) =1.169 ft

Therefore;

The length of chain she is allowed = 1.169 ft.

Answer:

a. True

Explanation:

In electromagnetic induction, the induced current always try to oppose the action that produces the induction (Lenz law). The approaching north end of the magnet will induce a current on the coil that will flow in an anticlockwise direction in the current (which induces a magnetism with the equivalent of a north pole of a magnet). The action of this induced current repels the magnet, in an effort to stop the motion that is producing the electromagnetic induction. When we also move the south pole of the magnet away from the coil, it induces an anticlockwise current in the coil, which tries to attract the south pole of the magnet so as to prevent it from moving. So both actions produce currents that flow in the same direction, which means that the needle of the galvanometer will deflect in the same direction.

Answer:

a. True

Explanation:

In electromagnetic induction, the induced current always try to oppose the action that produces the induction (Lenz law). The approaching north end of the magnet will induce a current on the coil that will flow in an anticlockwise direction in the current (which induces a magnetism with the equivalent of a north pole of a magnet). The action of this induced current repels the magnet, in an effort to stop the motion that is producing the electromagnetic induction. When we also move the south pole of the magnet away from the coil, it induces an anticlockwise current in the coil, which tries to attract the south pole of the magnet so as to prevent it from moving. So both actions produce currents that flow in the same direction, which means that the needle of the galvanometer will deflect in the same direction.

Answer:

The capacitor helps to store data even after the battery is removed

Explanation:

The cell phone is fitted with different types of capacitors, which come in all shapes and sizes. However they come, their main function is to store charges within them, and dissipate these charges when necessary.

This serves a great purpose in the printed circuit boards of phones as they provide the power needed for data to be stored even when the battery of the phone is removed.

A capacitor is a solid-state device because it has no moving part. It just stores charges within its parallel plates for the phone until the power is needed.

Answer:

Time taken for the car to travel a distance of 4.50 m = 1.40 seconds

Explanation:

velocity of toy car = 3.21 m/s

distance travelled by toy car = 4.50 m

Time = ?

[tex]Velocity = \frac{Distance}{Time} \\Time =\frac{Distance}{Velocity}[/tex]

[tex]Time = \frac{4.50}{3.21} \\Time = 1.40s[/tex]

Therefore, the time taken for the car to travel a distance of 4.50 m = 1.40 seconds

Answer:

The work done by the gas is 55.76 L*atm.

Explanation:

The work can be found as follows:

[tex] W = p\Delta V = p(V_{f} - V_{i}) [/tex]     (1)

Where:

p: is the pressure = 3.4 atm

V(f): is the final volume = 24 L

V(i): is the initial volume = 7.6 L

By replacing the above values into equation (1) we have:

[tex]W = p(V_{f} - V_{i}) = 3.4 atm(24 L - 7.6 L) = 55.76 atm*L[/tex]  

Therefore, the work done by the gas is 55.76 L*atm.

I hope it helps you!

Answer:

1: Light jog to get heart rate up for about 5 minutes

2: Static stretches held for 10 seconds each stretch to loosen up.

3: Activity specific drills such as high knees, butt kicks, skipping, grapevines.

4: 15-45 minute exercise or sport activity.

5: Walk to bring heart rate down, followed by stretches held for as long as 30 seconds.

Warming up and cooling down are essential steps to a good exercise routine. However, it is important to know the correct moment where each of these activities should be performed.

Based on this, we can consider that the correct steps are:

With that in mind, we can conceptualize Warming Up and Cooling Down as follows:

Thus, we can conclude that warming up and cooling down is essential for a good physical exercise routine, as it allows for the optimization of exercise and prevents injuries to the body.

You can find more information about this at the link below:

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Answer:

so the differences between both are that the mass is the amount of heaviness in an object or even of you but the weight normally is the mass multiplicated with the gravity of the earth and normally their are measured with this simple formula

M = V . D (mass = volumeby density)

Example

Volume = 3.000 cm³

Density  = 3.52 g/cm³

M = 3.000 . 3,52 = 10.560 g

Then you have the weight

To have the result you have to multiplicate the mass and the gravity acceleration

Answer:

Mass is the amount of matter in an object. Mass is often measured in kilograms or grams. The masses of two objects are compared using a balance. Weight is the downward pull on an object due to gravity. Weight is often measured in newtons or pounds, using a spring scale.

Explanation:

Just got it right edg. 2020

Answer

A

Explanation:

It is the rate of change of speed per unit time

Answer:

Mass=3,height=50 and time=15,g=10,P=?

P=mgh/t....which is 3×10×50=1500/15=100Watts

Answer:

[tex]\huge \boxed{\mathrm{100 \ Watts}}[/tex]

Explanation:

[tex]\sf \displaystyle P=\frac{mgh }{t} \\\\\\ P=power \ (W) \\\\ m=mass \ (kg) \\\\ g=gravity \ acceleration \ (m/s^2) \\\\ h=height \ (m) \\\\ t=time \ taken \ (s)[/tex]

[tex]\sf \displaystyle P=\frac{3 \times 10 \times 50 }{15}[/tex]

[tex]\sf \displaystyle P=\frac{1500 }{15}[/tex]

[tex]\sf \displaystyle P=100[/tex]

Explanation:

because the acceleration is negative, this indicates a deceleration (or slowing down) . Hence we can say that:

The car is decelerating (slowing down), i.e its velocity is decreasing, at a constant rate of 5m/s².

Answer:

Explanation:

pressure due to fluid  column = hdg where h is height of column , d is density of fluid , g is acceleration due to gravity .

Total pressure on the diver = atmospheric pressure + pressure due to water

= .70 x 13600 x 10 + 15 x 1050 x 10  

= 95200 + 157500

= 252700 Pa

= 2.527 x 10⁵ Pa .

Answer:

Moving the magnet away from the center of the loop with its south pole facing the center of the loop.

Explanation:

Electromagnetic induction is due to a rapidly changing magnetic field, or loop area. The poles of the magnet induce current in the loop but in the opposite direction, depending on the direction of their relative motion. An approaching north pole will induce an anticlockwise current in the loop, while an approaching south pole will do the reverse. To get the galvanometer to flicker in the same direction as of that when the north pole was approaching, we move the magnet away from the center of the loop with its south pole facing the center of the loop.

Answer:

E = 149.92 N/C

Explanation:

Given that,

The power emitted by a sinusoidal light is 60 W

Intensity is equal to the power per unit area. It can be given by :

[tex]I=\dfrac{P}{4\pi r^2}\\\\I=\dfrac{60}{4\pi \times (0.4)^2}\\\\I=29.84\ W/m^2[/tex]

The relation between the amplitude of the electric field and the intensity is given by :

[tex]I=\dfrac{E_o^2c \epsilon_o}{2}[/tex]

Here, [tex]E_o[/tex] is the amplitude of the electric field

[tex]E_o=\sqrt{\dfrac{2I}{c\epsilon_o}} \\\\E_o=\sqrt{\dfrac{2\times 29.84}{3\times 10^8\times 8.85\times 10^{-12}}}\\E_o=149.92\ N/C[/tex]

So, the amplitude of the electric field is 149.92 N/C.

Answer:

My answer is when the ball is going it experience kinetic energy which is the energy of a moving object while when the ball has stopped then it will have potential energy which means it's at rest so for the ball not to experience friction then there is a gain in kinetic energy and decrease in potential energy.

Answer:

Gain in Kinetic energy and decrease in Potential energy.

Explanation:

The energy possessed to a body due to its motion is called kinetic energy.

K = [tex]\frac{1}{2} .m.v^{2}[/tex]

The energy possessed to a body due to its position is called potential energy.

[tex]U =mgh[/tex]

Hence in free fall , the ball experiences gain in kinetic energy and decrease in potential energy.

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Answer:

the surface this works out to 9.8 m/s squared.

Given :

Speed of automobile for first 55 km , [tex]v_1=20\ km/h[/tex] .

Speed of automobile for first 60 km , [tex]v_2=55\ km/h[/tex] .

To Find :

Average velocity of the full trip .

Solution :

We know , average velocity is given by :

[tex]v_{avg}=\dfrac{\text{Total distance covered}}{\text{Total time taken }}[/tex]

Now , time is given by :

[tex]T=\dfrac{D}{v}[/tex]

So ,

[tex]v_{avg}=\dfrac{55+60}{\dfrac{55}{20}+\dfrac{60}{55}}\\\\v_{avg}=29.94\ km/h[/tex]

Therefore , the average velocity (km/h) of the car during the full 115 km trip is 29.94 km/h .

Hence , this is the required solution .

Answer:

we need to see the answers but probably 1 or -1

Answer:

The total distance traveled is 28 inches.

The displacement is 2 inches to the east.

 I hope this helps :)

Answer:

The displacement is 20 m northward.

The distance is 44 m

Explanation:

Let northward motion be in positive direction

Let southward motion be in negative direction

Dispalcement is the shortest path covered by the hockey puck at a specified direction.

The dispalcement of the hockey puck will be calculated as;

Displacement = 26 m northward - 12m southward + 6 m northward

Displacement =  20 m in northward direction

Distance is the total path covered by the hockey puck.

Distance = 26 m + 12m + 6 m

Distance = 44 m

Answer:

The displacement is 20 m northward.

The distance is 44 m

Explanation:

Answer:

D) 255pa

Explanation:

pressure= force/area

force = weight

weight= mass* gravitational acceleration

weight= 0.2kg*10m/s²

weight= 2N

area= πr² where r=1/2diameter

r=1/2diameter

r=1/2(10cm)

r=5cm or 0.05m

area= πr². where π 's approximate value is 3.14

area=3.14(0.05m)²

area=3.14 * 0.0025m²

area=0.00785m²

pressure= force/area

pressure=2N/0.00785m²

pressure=255pa approximately

Answer:

d 255 Pa

Explanation:

Answer:

Sodium

Explanation:

Sodium in period 3 has three electron shells. Recall that the period to which an element belongs shows the number of electron shells present in each atom of the element.

Beryllium is in period two, hence it possesses only two electron shells. However, beryllium is a member of group two hence it has two valence electrons in its outermost shell.

Sodium on the other hand has only one electron in its outermost shell since it is a member of group one. Hence the element must be sodium.

Explanation:

Yes, because the object will move to the right

Answer:

Explanation:

Sometimes.

Sometimes not.

If the surface is frictionless,  and the mass is 5 kg and the object is on a table, then likely 2 N will be enough to get it going.

If the object is on a table that needs a sandpaper/stain finish, then likely the 5 kg object will not overcome the rough surface of the table and there will likely not be any motion.

If the force is 2N and the object is on a frictionless surface and the object is a 1000kg mass, there might be motion but inertia would certainly be hard to overcome and I doubt there would be motion on planet earth.

2N is just not a very big force.

Answer:

true

Explanation:

Newton is the measure of the force with turns to be gravity multiplying the mass. Thus, the forces acts on the particles in the direction of the movement of the particles

Answer:

Magnitude = 14 metres

Direction = eastward.

Explanation:

A cross-country skier moves 36 meters eastward, then 44meters westward, and finally 22 meters eastward.

Whats the Magnitude and Direction?

The magnitude and direction will be the displacement of the cross country skier.

Let the east ward be positive and the west ward be negative.

Since the skier moves 36 meters eastward, then 44meters westward, and finally 22 meters eastward. Then, that will be:

36 - 44 + 22 = 14

Since the answer is positive, the magnitude is 14 and the direction is east ward.

Answer:

Ratio is used as a means of comparison of two or more subjects. It contain two or more digits which gives more information on the number of times an amount of number or times can be derived from the other/others.

An example of a ratio is 5:4 , 2:3 etc.

A ratio is also known as a noun and it can be used in sentences as follows:

The ratio of males to females in the school is five to eight. This can be translated as 5:8 in terms of mathematical expression.

Answer:

True the plastic will float because of the principle of flotation or buoyancy

Explanation:

Buoyancy explains it all!!

Buoyancy  is the upward force/upthrust experienced by a body immersed totally or partially in a liquid.

According to the principle of flotation:

"when a body is totally or partially immersed in liquid it experiences an upthrust which is equal to the volume of fluid displaced"

The plastic will float due to the fact the average density of the total volume of the plastic and the air inside it is less than the same volume of water it is floating in

Answer:

  a = 12 m / s²

Explanation:

Let's apply Newton's second law

             F = m a

where F is the force, m the mass of the body and the acceleration

we clear

            a = F / m

let's calculate

           a = 180/15

           a = 12 m / s²

this acceleration has the same direction of the force

As per the four items given in the question, the speed of each object is the same, then the basketball will have the greatest kinetic energy.

The force which a moving object has is referred to as kinetic energy in physics. It is defined as the number of effort required to propel a person of a specific mass from still to a specific velocity. Aside from slight fluctuations in speed, your body holds onto the kinetic energy it obtains during acceleration.

When the body slows down from its present level to a condition of rest, the exact same quantity of energy is used.

Formally, kinetic energy is any quantity that has a gradient with respect to time in the Lagrangian of a system.

As per the given information in the question,

As per the given items in the question, the basket ball will have the greatest kinetic energy because the kinetic energy is the product of mass and velocity and the mass of the basketball is greater than compared to the other objects.

To know more about Kinetic energy:

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Your question is seems incomplete, probably the complete question is:

If a student rolls a marble, basketball, beach ball, and a table tennis ball on the same surface at the same speed, which will have the greatest kinetic energy?

Answer:

The answer choice is C because La Nina Is the cooled part of the sea while El Nino is the warmed part of the sea.

Explanation:

You don't need to thank me... : )