Which statements represent convection? Select two options.

A. Black asphalt gets very hot on a sunny day.
B. The movement of air in a hot-air balloon makes it rise into the sky.
C. A dark sand beach can burn the soles of your feet.
D. A spoon gets warm from sitting in a soup pot.
E. A house has high heating bills because the heat ends up in the attic.
F. A house loses heat through an exterior wall.

Answer:

Mac’s Speed = 2.5 m/s

Tosh’s Speed = 4 m/s

Tosh moves 1.5 m/s faster than Mac.

Explanation:

Tosh starts from an initial position of 12m and in a span of 3 seconds, (1.00 seconds to 4.00 seconds) he moves 12 meters.

So his speed is distance / time

s = 12 / 3

s = 4 m/s

Mac starts from an initial position of 2m and in a span of 4 seconds, he traveled 10m (2.00m to 12.00m).

Speed = Distance / time

s = 10 / 4

s = 2.5 m/s

Answer:

1st – Place the film canister on the scale.

2nd – Slide the large weight to the right until the arm drops below the line and then move it back one notch.

3rd – Repeat this process with the top weight. When the arm moves below the line, back it up one groove.

4th – Slide the small weight on the front beam until the lines match up.

5th – Add the amounts on each beam to find the total mass to the nearest tenth of a gram.

Explanation:

The triple beam balance is an instrument that is used in measuring the mass of substances to a very high degree of precision. The reading error is given by ±0.05 grams. The triple beam balance as the name implies has three beams that measure substances of different mass levels.

The beams are categorized as small, medium, and large. There is a balance on which the substance to be weighed is placed directly upon. To use this measuring device, the procedures mentioned above are followed.

Answer:

The toy car stops after 10 seconds.

Explanation:

Constant Acceleration Motion

It's a type of motion in which the velocity of an object changes uniformly at a rate called acceleration.

Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:

[tex]v_f=v_o+at\qquad\qquad [1][/tex]

The toy car moves at vo=30 cm/s and decelerates at [tex]a=-3\ cm/s^2[/tex]. Note the negative sign of the acceleration that indicates the speed is decreasing over time.

We need to calculate the time needed for the toy car to stop vf=0.

To find the time, we solve [1] for t:

[tex]\displaystyle t=\frac{v_f-v_o}{a}[/tex]

Since all the units of speed and acceleration are in centimeters, we don't need to convert to meters

[tex]\displaystyle t=\frac{0-30}{-3}=10[/tex]

The toy car stops after 10 seconds.

Answer: Vx = 2.5m/s and Vy = 0m/s

Explanation: The ball is rolling horizontally on the floor, meaning there isn't a change in the vertical position, only horizontal. The ball is rolling with pure horizontal motion and isn't moving in the vertical direction.

Answer:

384,000

Explanation:

Time taken by light to travel from earth to moon t=1.28s

Let us assume that the speed of light = c

So, the distance traveled by light in this time = c x t

this will be the distance which light traveled to reach moon, so this will be the distance between earth and moon.

The speed of light is 300000 km/s

By putting the values

we get

Distance = c x t

= 300000 x 1.28 km

=384000 km

Answer:

on earth yes, but in space no because there is no gravity

Explanation:

plz can i have some points

The force exerted by an object depends on the mass of the object. Greater mass results in greater force. Hence, the statement is true.

Force is an external agent acts on a body to change the substance from the state of rest or motion. There are various kinds of force such as nuclear force, magnetic force, frictional force etc.

According to Newton's law of motion force in a moving body is the product of its mass and acceleration. Hence, force is directly proportional to mass and acceleration and an increase in these quantities will increase the force exerted by the body.

Thus, greater force is needed to a move a body with greater mass. If two objects of different masses exerts force each other, the greater force will be exerted by the massive body.

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Answer:

Gravity produces acceleration

Answer:

call for help and check if the person has not passed out (check their pulse.)

Explanation:

Surface waves are winds blowing through the  surface of ocean water. Therefore, option B is correct. All other options are just examples of waves and not wind.

Ocean water flows in currents, much like air does in the atmosphere. A current is an oceanic current, or stream, of flowing water. The primary cause of surface currents is wind, although not daily winds.

The main wind belts are what produce surface currents. These winds always blow in the same direction. so that they can maintain the direction of the water's flow.

Three factors influence surface currents: global wind patterns, Earth's rotation, and the configuration of ocean basins. Because they disperse heat over the earth, surface currents are crucial. Global climate is significantly influenced by surface currents as well.

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Answer:Answer is 66.66666666666667

Explanation:all you have to do is divide 200/3

Answer:

66 seconds

Explanation:

time=distance/speed

200/3=66.6

Answer:

35 mph

Explanation:

From the question given above, the following data were obtained:

Time (t) = 2 hours

Distance (d) = 70 miles

Speed (S) =.?

Speed is simply defined as the distance travelled per unit time. Mathematically, it is expressed as:

Speed (S) = Distance (d) / Time (t)

S = d/t

With the above formula, we can calculate how fast (i.e the speed) Joe will need to drive to make it to his Grandma's house on time. This can be obtained as follow:

Time (t) = 2 hours

Distance (d) = 70 miles

Speed (S) =.?

S = d/t

S = 70/2

S = 35 mph

Therefore, Joe will drive at 35 mph in order to get to his Grandma's house on time.

Answer:

your answer should be c

Answer:

D.the branch that deals with the relations of organisms to one another and to their physical surroundings

¡Hello!

Topic: Electrostatic

For calculate electric force, we can apllicate formula:

                                                [tex]\boxed{\boxed{\bold{F = k * \frac{q*q'}{r^{2} } } } }[/tex]

[tex]\sqrt{[/tex] F = Electric Force

[tex]\sqrt{[/tex] k = Coulomb Constant = 9x10^9

[tex]\sqrt{[/tex] q = Charges = 1 C

[tex]\sqrt{[/tex] r = Distance = 3000 m

Let's replace according the information, and let's resolve it:

F = 9x10^9 * (1 * 1) / 3000²

F = 9x10^9 * 1 / 9000000

F = 9x10^9 * 1.1111111e-7

F = 1000 N

Result:

The electric force is of 1000 N

Good luck

Answer:

Mechanical energy

Explanation:

Mechanical energy is needed for movement of objects. Muscles convert chemical energy provided by the rest of the body to allow movement.

Answer:

[M L2 T-2]

Explanation:

hope this is what you're looking for.

Answer:

5N westward, acting on the student

Explanation:

Answer: 5N westward, acting on the student

Explanation:

Answer:

We have a mass of 200g (0.2kg) moving at 20m/s

Kinetic Energy KE = ½ mv^2 where m is mass and v is velocity

Actually, v is a vector quantity, so KE = ½ mv•v

The dot product of 2 vectors a and b is abCosθ where θ is the angle between the vectors.

Obviously v•v = v^2 Cos0 = v^2

In this case, we have KE = ½ (0.2)(20^2) = 40kg-m^2/s^2 = 40J

So we have kinetic energy in the amount of 40 Joules.

Explanation:

The right answer is "2.7 J"

Answer explanation:

Remember to convert grams to kilograms first by dividing by 1000.

Kinetic energy

= 1/2 × mass × speed2

= 1/2 × 0.2 kg × (5.2 m/s)^2

= 2.7 J (to 2 sig. fig.)

Hope it helps ✨✨

A current of 15 amperes is flowing with a resistance of 0.10 ohms, then the voltage will be equal to 1.5 volts.

When put in an electromagnetic field, charged matter experiences a force due to the fundamental property of electric charge. Positive or negative electrical ions are possible.

When two charges are in opposition to one another, they repel one another. The term "neutral" refers to an object that has no net charge. The early understanding of the way charged particles interact is now referred to as classical electrodynamics, and it is still true for issues that do not demand taking into account quant phenomena.

Electrical charge is a preserved attribute, meaning that the net charge of an isolated system—that is, the sum of the positive and negative charges—cannot change. Particles at the subatomic level carry an electric charge.

As per the data given in the question,

Current, I = 15 A

Resistance, R = 0.10 ohms

Then, the voltage (V) will be,

V = RI

V = 15 × 0.10

V = 1.5 volts.

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Answer:

Acceleration from gravity is always constant and downward, but the direction and magnitude of velocity change. At the highest point in its trajectory, the ball has zero velocity, and the magnitude of velocity increases again as the ball falls back toward the earth

Explanation:

Answer:

No

Explanation:

becuse it's not even outer space there's acceleration there's no such thing as Zero acceleration speed except if you're not in motion.

Answer:

you get to participate in a activity but not in PE that you have to do

Explanation:

Answer:

mechanical energy

Explanation:

The key difference that exists between kinetic energy and potential energy lies in the fact that, potential energy is that form of mechanical energy which is stored within an object, ready to be released as and when needed to do some work, while, kinetic energy is that form of mechanical energy that has been released and is associated with the body in motion.

Answer:

I don't know how it works, but I found this on the internet. image does not belong to me.

hope it helps!

Answer:

X-RAY

Explanation:

I took the test on study island

Answer:

15,115 J of the total energy is transformed to thermal energy during the game.

Explanation:

From the law of conservation of energy, initial energy of the closed system E = final energy of closed system , E'

E = E'.

Let ME = initial mechanical energy of the system = 16,250 J and U = initial internal energy of the system and ME' = Final mechanical energy of the system = 1,135 J and U' = Final internal energy of the system.

So E = ME + U and E' = ME' + U'

We now find U and U'

Substituting E, ME, E' and ME' into the equations, we have

E = ME + U

17,125 J = 16,250 J + U

U = 17,125 J - 16,250 J

U = 875 J

E' = ME' + U'

17,125 J = 1,135 J + U'

U' = 17,125 J - 1,135 J

U' = 15,990 J.

The change in internal energy is also the change in thermal energy. So,

ΔU = U' - U

ΔU = 15,990 J - 875 J

ΔU = 15,115 J

So 15,115 J of the total energy is transformed to thermal energy during the game.

Answer:

b

Explanation

Answer: 5.3 ms east

Explanation:

Answer:

An object that does not vibrate cannot produce sound

Explanation:

It is given that,

Initial speed of a golfer, u = 29 m/s

If it travels the maximum possible distance before landing. It means that it is projected at an angle of 45 degrees.

(a) We need to find the time spent by the ball in the air. It can be calculated by using second equation of motion.

[tex]s=ut+\dfrac{1}{2}at^2[/tex]

Here,

a = -g

s = 0 (it is displacement and it is equal to 0 as the ball lands on the green).

So,

[tex]0=29\sin(45)t-\dfrac{1}{2}\times 9.8t^2\ (\text{Initial vertical component of velocity is taken})\\\\-4.9t^2+29\times \dfrac{1}{\sqrt2}t=0\\\\-4.9t^2+20.5t=0\\\\t=0,4.184\ s[/tex]

So, it will take 4.184 seconds in the air.

(b) let x is the longest hole in one that the golfer can make if the ball does not roll when it hits the green. It can be given by :

[tex]x=vt\cos\theta\\\\x=29\times 4.184\times \cos(45)\\\\x=85.79\ m[/tex]

Hence, this is the required solution.

Answer:

Runner A will be 0.05 km from the flagpole, and runner B will be 0.07 km from the flagpole

Explanation:

We can find when their paths will cross as follows:

[tex] X_{f} = X_{0} + v_{0}t + \frac{1}{2}at^{2} [/tex]

Where:

[tex]X_{f}[/tex] is the final position

[tex]X_{0}[/tex] is the initial position

v₀ is the initial speed

t is the time

a is the acceleration = 0 (since they are running with a constant velocity)

When their paths cross we have:

[tex]X_{fA}+X_{fB}=5.8+4.9=10.7 km[/tex]

[tex]V_{A}t+V_{B}t=10.7[/tex]

[tex]8.6t+7.1t=10.7[/tex]

[tex]t = 0.68 h[/tex]

Now we can find the final distance of each runner.

[tex]X_{fA}=V_{A}*0.68[/tex]

[tex]X_{fA}=8.6*0.68 km[/tex]

[tex]X_{fA}=5.85 km[/tex]

[tex]X_{fB}=V_{B}*0.68[/tex]

[tex]X_{fB}=7.1*0.68[/tex]

[tex]X_{fB}=4.83 km[/tex]

Therefore, runner A will be 0.05 km from the flagpole, and runner B will be 0.07 km from the flagpole.

I hope it helps you!

Answer:

elephant

Explanation:

Answer:

elephant

Explanation:

Answer:

no

Explanation:

only the ones near the surface have enough kinetic energy

Answer:

no

Explanation:No, all the molecules of the liquid do not take part in evaporation only those molecules near the surface of liquid which acquire sufficient Kinetic energy (Thresold velocity) escape as they  attractive forces of other molecules. Then other molecules come to the surface of the liquid and acquire more K.E. and escape the surface. This continues till all the liquid evaporates.

Answer:

C

Explanation:

I'm not 200% sure whether net acceleration would be F1 - F2 or F1 + F2, but C works in both scenarios. Either the net acceleration is 18 N, which is the lowest, or it is 8 N, which is also the lowest.