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3 years ago

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Please help.. I'm desperate.

1 answer:

rosijanka [135]3 years ago

7 0

Answer:

Newton's Second Law tells us that the more mass an object has, the more force is needed to move it. A larger rocket will need stronger forces (eg. more fuel) to make it accelerate. The space shuttles required seven pounds of fuel for every pound of payload they carry.

Explanation:

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which symbol in the first law of thermpdynamics represents energy that moves from a hot object to a cooler object?

Marysya12 [62]

The triangle <span>in the first law of thermodynamics, represents energy that moves from a hot object to a cooler object.</span>

4 0

3 years ago

The brick wall (of thermal conductivity 0.35 W/m ·◦ C) of a building has dimensions of 2.7 m by 6 m and is 16 cm thick. How much

Gwar [14]

Answer:

$Q = 54.577\,MJ$

Explanation:

The heat transfer through brick wall is:

$\dot Q = \frac{k\cdot A}{L}\cdot \Delta T$

$\dot Q = \frac{\left(0.35\,\frac{W}{m\cdot ^{\circ}C} \right)\cdot (2.7\,m)\cdot (6\,m)}{0.16\,m} \cdot (31^{\circ}C - 8^{\circ}C)$

$\dot Q = 815.063\,W$

The heat flow in a 18.6-h period is:

$Q = \dot Q \cdot \Delta t$

$Q = (815.063\,W)\cdot (18.6\,h)\cdot \left(\frac{3600\,s}{1\,h} \right)$

$Q = 54576618.48\,J$

$Q = 54.577\,MJ$

8 0

3 years ago

Read 2 more answers

What are the coordinates of the point that is 1/5 of the way from A(-7,-4) to B(3, 6)?

Olegator [25]

Answer:

coordinate will be

r = (1.33,4.33)

Explanation:

As we know that if a point will divide two given coordinates in m : n ratio

then in that case the point is given as

$x = \frac{mx_1 + nx_2}{m+n}$

$y = \frac{my_1 + ny_2}{m+n}$

here we know that two points are

(-7, -4) and (3, 6)

and the ratio is given as 1 : 5

now from above formula we will have

$x = \frac{1(-7) + 5(3)}{1 + 5} = 1.33$

$y = \frac{1(-4) + 5(6)}{1 + 5} = 4.33$

so coordinate will be

$r = (1.33, 4.33)$

7 0

3 years ago

in an experiment performed in a space station a force of 6 n causes an object to have an acceleration equal to 4 m / S2 II what

spayn [35]

F = m A

m = F / A

m = 6N / 4m/s^2

m = 1.5 kg

8 0

3 years ago

You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizont

Scilla [17]

Answer:

$R_{max} = 51.84 m$

Explanation:

When we shoot the dart upwards the time taken by the dart to go straight up and again come back is given as

$t = 4.6 s$

here we can say

$\Delta y = 0 = v_i t + \frac{1}{2}at^2$

$0 = v_i t - \frac{1}{2}(9.8)t^2$

put t = 4.6 s then we have

$v_i = 22.54 s$

Now in order to find the maximum range we can say

$R = \frac{v^2 sin2\theta}{g}$

so in order to have maximum range we can say

$\theta = 45 degree$

$R_{max} = \frac{v^2}{g}$

$R_{max} = \frac{22.54^2}{9.8}$

$R_{max} = 51.84 m$

5 0

3 years ago