What kind of atmosphere surrounds mercury?
none
carbon dioxide
methane
dense clouds

Answer:

2.13 x 10^-5

Explanation:

light travels at 3.00 x 10^8 m/s

it's like if someone asks how long would it take for a car to go 100 miles if it's traveling 50 miles per hour

you would do

100 ÷ 50

6.4 x 10^3 ÷ 3.00 x 10^8

2.13 x 10^-5

The markdown price for a mountain bike is $584.35

Markdown price is the discount offered by the shopkeepers to the customers to increase the sales rate.

M.P = S.P (1-r/100)

The following expression can be used every time we have to find the markdown price.

Substitute Selling price S.P =$899 and the percent r =35/100 =0.35, we get

M.P = $899(1-0.35)

M.P =$584.35

Thus, the markdown price is $584.35

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Answer:

B

Explanation:

i hope this is correct.

The image as shown here can here can be used to describe charging by induction.

A charge may be positive or negative. One of the methods of transferring a charge is by induction.

In this case, an objects induces an opposite charge on a material.  The image as shown here can here can be used to describe charging by induction.

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Answer:

friction

Explanation:

1. The length of the bridge is 360 m.

2. The speed of train in km/hr to cross the bridge in 24 s is 72 km/hr.

3. The length of the train when it cross the bridge in 36 seconds is 540 m.

What is speed?

Speed is the ratio of distance traveled and the time taken to cover that distance.

1.

The speed of train m/s is 54 x 5/18 = 15 m/s

The train crosses the bridge in 32 s, distance traveled by train will be

=32 x 15 =480m

The length of the bridge = (480 -120) =360 m

Thus, the length of the bridge is 360 m.

2.

Speed of train in m/s to cross the bridge in 24 s

= 480/24 = 20 m/s

Speed in km/hr =20 x 18/5 = 72 km/hr

Thus, Speed of train in km/hr to cross the bridge in 24 s is 72 km/hr.

3.

Speed of train in m/s =15 m/s

Train crosses the bridge in 36 s, then length of train will be

= 15 x 36m = 540m

Thus,  the length of the train when it cross the bridge in 36 seconds is 540 m

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Answer:9.17 m|s

Explanation:

explanation shown

Apply conservation of momentum

[tex]\\ \rm\Rrightarrow m1v1+m2v2=(m1+M2)v3[/tex]

[tex]\\ \rm\Rrightarrow 0.045(400)+16(0)=(0.045+16)V3[/tex]

[tex]\\ \rm\Rrightarrow 18=16.045v3[/tex]

[tex]\\ \rm\Rrightarrow v3=1.12m/s[/tex]

When plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be type S.

Type S fuses are also called tamper proof fuses because each fuse size has a different base and thread size.

These fuses also require the use of a special adapter which is screwed into the standard Edison base of the fuse holder.

Thus, when plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be type S.

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Answer:

the density of water is 1 and tin is 7.31 if i remember right

Explanation:

Answer:

.25 Hz

Explanation:

Period = 4 sec

freq = 1/p = 1/4 hz  = .25 Hz

Both rocks hit the ground at the same time and at the same distance from the base of the cliff. Option A is correct.

Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. it is denoted by u for the initial speed while u for the final speed. its SI unit is m/sec.

If the  resistance is ignored, things falling near the Earth's surface have the same estimated acceleration due to gravity of 9.8 meters per second.

As a result, the objects' acceleration is the same, and their velocity is growing at a consistent pace.

So that both rocks hit the ground at the same time and at the same distance from the base of the cliff.

Hence, option A is correct.

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Answer

When you are riding in a coaster car that is traveling at a constant speed, you only feel the downward force of gravity. But as the car speeds up or slows down, you feel pressed against your seat or the restraining bar. You feel this force because your inertia is separate from that of the coaster car.

Explanation:

The increase in temperature that will result if 225.0 g of copper absorbs 5000 J of heat energy is 57.72°C.

The temperature change of a substance can be calculated using the following formula:

Q = m × c × ∆T

Where;

5000 = 225 × 0.385 × ∆T

5000 = 86.63∆T

∆T = 5000/86.63

∆T = 57.72°C

Therefore, the increase in temperature that will result if 225.0 g of copper absorbs 5000 J of heat energy is 57.72°C.

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Answer:

  170 N

Explanation:

Impulse is the change in momentum. Momentum is the product of mass and velocity. These are related to applied force by ...

  F·Δt = m·Δv

__

Here, the velocity goes from 0 to 34 m/s in 0.0116 s. The mass is 0.058 kg. Filling in the given values, we have ...

  F(0.0116 s) = (0.058 kg)(34 m/s)

  F = 0.058×34/0.0116 kg·m/s² ≈ 170 N

The required force is 170 newtons.

Use the work-energy theorem. The total work W performed on the car as it it slows to a stop is equal to the change in the car's kinetic energy ∆K. So

W = ∆K

W = 0 - 1/2 (1000 kg) (72 km/h)²

W = - (500 kg) (20 m/s)²

W = - 200,000 J = -2 × 10⁵ J

The closest answer would be C, but friction opposes the car's motion so the work would be negative.

Answer: True

Explanation:

A scalar quantity is those quantities that only have magnitude and no direction. Therefore the value doesn't change with direction.

The force must be applied for motor to keep the package moving is 50 N.

Force is the action of push or pull the object in order to make it move or stop.

Power is related to force and velocity as

P = F x v

150 W = F x 3 m/s

F  =50 N

Thus, the force must be applied for motor to keep the package moving is 50 N.

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Answer:

Explanation:

I'm assuming you need this answer quickly.

Using what we know:

The energy of a single 400 nm photon is 3.1 eV.

So a photon of 412 nm wavelength would have the energy of 4.0 ev.

Inboard gasoline boats built after July 31st, 1981 must have a mechanical type of ventilation system.

A mechanical ventilation system can be defined as a device in which circulates fresh/cold currents of air.

A mechanical ventilation system is based on the use of systems of ducts capable of ventilating the device.

In conclusion, inboard gasoline boats built after July 31st, 1981 must have a mechanical type of ventilation system.

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Answer:

The answer is A. White Dwarf

Explanation:

Answer:

5 meters

Explanation:

4  and  3   are legs of a right triangle with the hypotenuse = displacement

Use Pythagorean theorem

4 ^2 + 3^2 = (displacement)^2

displacement = 5 m

The displacement of the object that moved 4 meters north, then 3 meters east is 5 meters.

Displacement is change in the position of an object. It can be described as the shortest distance between the initial and final position of an object.

The displacement of the object is calculated as follows;

d² = 4² + 3²

d² = 25

d = 5 m

Thus, the displacement of the object that moved 4 meters north, then 3 meters east is 5 meters.

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Answer:

Normal, Gravitational, Applied, Friction, and Tension

Explanation:

Because the sled is on the ground, or rather because it is on the earth, it will have a force of gravity, or its weight, pulling it down.

There is a normal force because the sled is not moving into the ground, so there needs to be a force pushing on the sled from the ground. Additionally, Newton's 3rd law states that for every action there is an equal but opposite reaction, if it's in equilibrium or not moving.

There will be an applied force since the child is pulling the sled and is applying a force to do so.

There will be a friction force that is pulling the sled opposite the direction it is moving, since it is on the ground that is presumably not fricitonless.

There will be a tension force pulling on the sled by the rope. However there is also a tension force pulling on the child's hand by the rope, meaning that these are internal forces and essentially balance out, but they are still there.

There is no air resistance force, or very little of it, since the object is not falling.

Answer:

0.12m/s

Explanation:

v=λf

Given that, λ = 12cm = 0.12m

T = 1second

(A period T is the time required for one complete cycle of vibration to pass a given point)

frequency 'f' is unknown but we can get frequency from f = 1/T = 1/1 = 1Hz

therefore, v= 0.12 × 1 = 0.12m/s

The quantity of heat that was transferred to the block of iron is 5544 J or 5.544 kJ

From the question, we are to determine how much heat was transferred to the block of iron

Using the formula,

Q = mcΔT

Where Q is the quantity of heat

m is the mass

c is the specific heat capacity of the substance

and ΔT is the change in temperature

From the given information,

m = 0.400 kg

ΔT = 325 - 295 = 30 K

Putting the parameters into the equation, we get

Q = 0.400 × 462 × 30

(NOTE: Specific heat capacity of iron = 462 J/kg.K)

∴ Q = 5544 J

Hence, the quantity of heat that was transferred to the block of iron is 5544 J or 5.544 kJ

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Answer:

1)10 m/s

2) 20 m/s

3) 2 s

4) 500 m

5)1000 km/h

Average speed = distance travelled / time.

( note: distance must be in (m) and time in sec, if not then you convert ).

1) average speed = 20/2 = 10mls.

2) average speed = 100/5 = 20 m/s.

3) since we aren't given (time) let's call it x

so we replace the unknown time with x..

average speed = 2/x = 1

then cross multiply

you get x (the unknown time) as 2s {seconds}.

(to check if it's correct just add the time we got back into the equation and see if you would get a erage speed as 1m/s).

4) do the same, replace distance as x or any letter you want )

average speed = x/ 10 = 50

cross multiply

you get x = 500m {meters}

5) (we need to convert km to meters and time to secs because that's what we are working with).

200km = 200,000 m { to convert to meters you multiply the given by 1000, 1km = 1000m).

for 2h, we know that:

60 seconds makes 1 minute

60 minutes makes an hour.

so we multiply 60 by 60 we get 3600mins then we multiply it by 2 to get 7200 secs

so now

Average speed = 200,000/7200 = 27.77 m/s.

Here you go..

hope this helps

Good luck and ace that test.

#1

Here

Calcium is less reactive than sodium so it can't displace Na .

Nothing will happen

#2

This is oxidation