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Tema [17]
3 years ago
15

I'm not an idiot so I'm pretty sure c and d are not the answers. I'm confused because don't they both do this. As it picks up sp

eed it uses kinetic energy but its the gravity pulling it down.
When driving downhill, your vehicle will accelerate and start moving fast, due to _______________.
A. kinetic energy
B. gravity
C. the amount of pressure you put on the accelerator pedal
D. wet pavement
Physics
2 answers:
krok68 [10]3 years ago
8 0
The answer is A because it's MOVING

ithink
nataly862011 [7]3 years ago
6 0
It's B.  Gravity is the force causing the car to accelerate.  As it goes down the hill the gravitational potential energy it had at the top of the hill is converted into kinetic energy.  That is, the car gains kinetic energy as a result of its increased speed, the kinetic energy is not causing the car to accelerate.  It is only a function of its current speed.
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An airplane has an effective wing surface area of 19.4 m2 that is generating the lift force. In level flight the air speed over
alexgriva [62]

Answer:

W =23807.68 N

Explanation:

given,

surface area of wing = 19.4 m²

speed over top wing = 67 m/s

speed under wing = 51 m/s

density of air =  1.3 kg/m³

weight of plane

From Bernoulli's principle

P_1 + \dfrac{1}{2}\rho v_1^2 = P_2 + \dfrac{1}{2}\rho_2^2

where 1 and 2 are two different locations at the same geo potential level  

so if we call 1 the lower surface and 2 the upper surface,

we find the pressure differential, P₁ -P₂

\Delta P =\dfrac{1}{2}\rho (v_2^2-v_1^2)

\Delta P =\dfrac{1}{2}\times 1.3 \times (67^2-51^2)

\Delta P =1227.2\ N/m^2

then the force acting on the plane is

F=P A

F=1227.2 x 19.4

F =23807.68 N

weight of the plane

W =23807.68 N

7 0
3 years ago
Suppose that, while lying on a beach near the equator watching the Sun set over a calm ocean, you start a stopwatch just as the
Yuri [45]

Ans:  Let d is the distance from height to our eyes.

<span>Applying the Pythagoras theorem, we  get,</span>

<span>Check image: </span>

7 0
3 years ago
Weather stays the same all the time
VikaD [51]
False. Weather has periods of change, imagine a rainy day and a sunny day, it is a change in weather
7 0
3 years ago
What provides the source of the earth’s magnetic field?
ololo11 [35]
<h2>Answer: the core of the earth</h2>

The explanation accepted by science until now, indicates that Earth's magnetic field is generated in the deepest of the terrestrial nucleus.

This is due to the movements of liquid metals in the core of the planet.

To explain it in more detail:

Right in the center of the Earth there is an internal core of solid iron at a very high temperature, this iron is as hot as the surface of the Sun, however, the pressure caused by the gravity force prevents it from becoming liquid. Around this inner core is the outer core, a layer of approximately 2000 km thick, composed of iron, nickel and small amounts of other metals in liquid state. Due to the lower pressure of the outer core, in relation to the inner core, the metal here is fluid (molten).

The differences in temperature, pressure and composition within the outer core cause convection currents in the molten metal, as the cold, dense matter sinks, and the warm, less dense matter rises. In addition, the Coriolis force, resulting from the spin of the Earth, also causes eddies in this mixture of molten metals.

This is how the movement of liquid iron inside the Earth generates electric currents, which in turn produce magnetic fields, and the spiral caused by the Coriolis force causes the magnetic fields to align in approximately the same direction, being this combined effect added to produce a vast magnetic field that envelops the entire planet.

This field extends from the terrestrial nucleus, progressively attenuating itself in outer space. However, it should be noted that unlike the field of a bar magnet, the Earth's magnetic field changes over time because it is actually generated by the movement of the iron alloys in the Earth's outer core, which causes the poles to move.

8 0
3 years ago
Some metals have a molecular structure that makes them good conductors. Explain how understanding this relationship can help eng
Brums [2.3K]

Good conductors can give us more electrical energy. Advanced batteries today use ion charges for the batteries.

5 0
3 years ago
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