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2 years ago

Please help me someone !

Physics

1 answer:

san4es73 [151]2 years ago

7 0

Answer:

The object is moving at constant speed.

Explanation:

The spaces between the dots are equal.

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Two rockets are flying in the same direction and are side by side at the instant their retrorockets fire. Rocket A has an initia

lara31 [8.8K]

Answer:

-22.2 m/s²

Explanation:

The equation for position x for a constant acceleration a, time t and initial velocity v₀, initial position x₀:

(1) $x=\frac{1}{2}at^2+v_0t+x_0$

For rocket A the initial and final position: x = x₀= 0. Using these values in equation 1 gives:

(2) $0=\frac{1}{2}at^2+v_0t$

Solving for time t:

$-\frac{1}{2}at^2=v_0t$

(3) $t=-\frac{2v_0}{a}$

The times for both rockets must be equal, since they start and end at the same location. Using equation 3 for rocket A and B gives:

(4) $\frac{v_{0A}}{a_A}=\frac{v_{0B}}{a_B}$

Solving equation 4 for acceleration of rocket B:

(5) $a_B=a_A\frac{v_{0B}}{v_{0A}}$

3 0

3 years ago

A 7.5 kg block is placed on a table. if it's bottom surface area is 0.6m2, how much pressure does the block exert on the tableto

xeze [42]

The answer to this is B.

3 0

3 years ago

The earth has radius R. A satellite of mass 100 kg is in orbit at an altitude of 3R above the earth's surface. What is the satel

Vera_Pavlovna [14]

Answer:

W= 61.3 N

Explanation:

The only force acting on the satellite is the one due to the attraction from Earth, which obeys the Newton's Universal Law of Gravitation, as follows:

Fg =G*ms*me / (res)²

This force, also obeys the Newton's 2nd Law, so we can write the following equation:

G*ms*me*/ (res)² = ms* a = ms*g

We call to the product of the mass times the acceleration caused by gravity (g), the weight of this mass, so we can write as follows:

G*ms*me / (res)² = ms*g = W (1)

where G = 6.67*10⁻11 N*m²/kg², ms= 100 kg, me= 5.97*10²⁴ kg, and

res= 4 *re = 4*6.37*10⁶ m.

Replacing all these known values in (1), we get the value of W:

W =(( 6.67*5.97/(4*6.37)²) *( 10⁻¹¹ * 10²⁴ /10¹²) )* 100 N = 61.3 N

6 0

3 years ago

A 0.0780 kg lemming runs off a

kotegsom [21]

Answer:

5.01 J

Explanation:

Info given:

mass (m) = 0.0780kg

height (h) = 5.36m

velocity (v) = 4.84 m/s

gravity (g) = 9.81m/s^2

1. First, solve for Kinetic energy (KE)

KE = 1/2mv^2

1/2(0.0780kg)(4.84m/s)^2 = 0.91 J

so KE = 0.91 J

2. Next, solve for Potential energy (PE)

PE = mgh

(0.0780kg)(9.81m/s^2)(5.36m) = 4.10 J

so PE = 4.10 J

3. Mechanical Energy , E = KE + PE

Plug in values for KE and PE

KE + PE = 0.91J + 4.10 J = 5.01 J

4 0

2 years ago

Norepinephrine and epinephrine influence all of the following except __________ functioning.

Arada [10]

the answer is sex drive, I just took the test

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3 years ago

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