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3 years ago

Please help me with this science question

Physics

1 answer:

NeX [460]3 years ago

5 0

Heat flows from hotter to colder objects
metal rod<fire
hat>snowman
ice cube<warm water

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You toss a walnut at a speed of 15.0 m/s at an angle of 50.0∘ above the horizontal. The launch point is on the roof of a buildin

kaheart [24]

Answer:

a.3.51s

b.33.8m

c. 9.64,-22.9

Explanation:

8 0

3 years ago

Air as an ideal gas enters a diffuser operating at steady state at 5 bar, 280 K with a velocity of 510 m/s. The exit velocity is

Nataly [62]

Answer:

Explanation:

Calculating the exit temperature for K = 1.4

The value of $c_p$ is determined via the expression:

$c_p = \frac{KR}{K_1}$

where ;

R = universal gas constant = $\frac{8.314 \ J}{28.97 \ kg.K}$

k = constant = 1.4

$c_p = \frac{1.4(\frac{8.314}{28.97} )}{1.4 -1}$

$c_p= 1.004 \ kJ/kg.K$

The derived expression from mass and energy rate balances reduce for the isothermal process of ideal gas is :

$0=(h_1-h_2)+\frac{(v_1^2-v_2^2)}{2}$ ------ equation(1)

we can rewrite the above equation as :

$0 = c_p(T_1-T_2)+ \frac{(v_1^2-v_2^2)}{2}$

$T_2 =T_1+ \frac{(v_1^2-v_2^2)}{2 c_p}$

where:

$T_1 = 280 K \\ \\ v_1 = 510 m/s \\ \\ v_2 = 120 m/s \\ \\c_p = 1.0004 \ kJ/kg.K$

$T_2= 280+\frac{((510)^2-(120)^2)}{2(1.004)} *\frac{1}{10^3}$

$T_2 = 402.36 \ K$

Thus, the exit temperature = 402.36 K

The exit pressure is determined by using the relation: $\frac{T_2}{T_1} = (\frac{P_2}{P_1})^\frac{k}{k-1}$

$P_2=P_1(\frac{T_2}{T_1})^\frac{k}{k-1}$

$P_2 = 5 (\frac{402.36}{280} )^\frac{1.4}{1.4-1}$

$P_2 = 17.79 \ bar$

Therefore, the exit pressure is 17.79 bar

7 0

3 years ago

What can happen when two plates bordering each other suddenly move and release energy

Ostrovityanka [42]

The correct answer for this question would be an EARTHQUAKE. What happens when two plates bordering each other suddenly move and release energy is an earthquake. When these plates slip one another and energy is released, this results in an earthquake. Hope this answer helps.

5 0

3 years ago

The earth’s gravity pulls with a force of 10N on each kilogram of an object mass calculate the weight of a 15kg sack of potatoes

maw [93]

Answer:

150 N

Explanation:

10*15 = 150 N

4 0

2 years ago

. Increasing the pressure on a gas __________ the volume the gas occupies. (Points : 1)

skelet666 [1.2K]

A increases plz dont report if wrong just tell me an ill fix it

5 0

3 years ago