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3 years ago

PLEASE HELP TOPIC - CONVECTION

Physics

1 answer:

Alex777 [14]3 years ago

6 0

Answer:

Dry air burns out and gets warm
It's smoke and smoke always rises
Not ours
It makes sure no air is inside bc air gets cold an freezes

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5. If R,= 5 ohms and R2 = 5 ohms, answer the following questions. How does the current through R, compare to the current through

Fiesta28 [93]

Answer:

ohms is power power is electricity

5 0

3 years ago

A particle's position is given by x = 7.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) What is its velocity

spin [16.1K]

$x(t)=7.00\,\mathrm m-\left(9.00\dfrac{\rm m}{\rm s}\right)t+\left(3\dfrac{\rm m}{\mathrm s^2}\right)t^2$

a. The particle has velocity at time $t$ ,

$\dfrac{\mathrm dx(t)}{\mathrm dt}=-9.00\dfrac{\rm m}{\rm s}+\left(6\dfrac{\rm m}{\mathrm s^2}\right)t$

so that after $t=1\,\mathrm s$ it will have velocity $\boxed{-3.00\dfrac{\rm m}{\rm s}}$ .

b. The sign of the velocity is negative, so it's moving in the negative $x$ direction.

c. Its speed is 3.00 m/s.

d. The particle's velocity changes according to

$\dfrac{\mathrm d^2x(t)}{\mathrm dt^2}=6\dfrac{\rm m}{\mathrm s^2}$

which is positive and indicates the velocity/speed of the particle is increasing.

e. Yes. The velocity is increasing at a constant rate. Solving for $\dfrac{\mathrm dx(t)}{\mathrm dt}=0$ is trivial; this happens when $\boxed{t=1.50\,\mathrm s}$ .

f. No, the velocity is positive for all $t$ beyond 1.50 s.

5 0

3 years ago

A quarterback claims that he can throw the football a horizontal distance of 167 m. Furthermore, he claims that he can do this b

pychu [463]

Answer:u=42.29 m/s

Explanation:

Given

Horizontal distance=167 m

launch angle $=33.1^{\circ}$

Let u be the initial speed of ball

Range $=\frac{u^2\sin 2\theta }{g}$

$167=\frac{u^2\sin (66.2)}{9.8}$

$u^2=1788.71$

$u=\sqrt{1788.71}$

$u=42.29 m/s$

7 0

3 years ago

If the forces on an object are greater than zero, the motion of an object will what?

natulia [17]

If the forces on an object are greater than zero,the object will definitely in the motion. This concept in accordance with law of inertia.

<h3>What is force?</h3>

Force is defined as the push or pulls applied to the body. Sometimes it is used to change the shape, size, and direction of the body.

Newton's law of inertia states that a body wants to continue its motion until the external force is not acted on it.

Hence, if the force is grater than zero, the body will be in motion.

To learn more about the force, refer to the link;

brainly.com/question/26115859

#SPJ1

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2 years ago

PLEASE HURRY! :) TEN PTS + BRAINLIEST TO FIRST BEST ANSWER!

Zepler [3.9K]

Answer:

object 1 had faster-moving particles.

8 0

4 years ago