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SCORPION-xisa [38]

3 years ago

13

Suppose the total momentum of two masses before a collision is 100 kg m/s. What is the total momentum of the two masses after th

ey collide? A. 0 kg m/s B. 50 kg m/s C. 100 kg m/s D. 200 kg m/s Is the answer D?

1 answer:

soldier1979 [14.2K]3 years ago

4 0

No, momentum is conserved so:
momentum before=momentum after
it is C. 100 kg m/s

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A mover does 422 J of work pushing a crate 8.39 m. How much force did he exert?

kicyunya [14]

Answer:

50.3N

Explanation:

Work done = force x distance

422J. = force x 8.39m

÷8.39 both side to get force

Force is 50.3N to 1 d.p.

Check:

50.3 x 8.39=422.017J

Same as 422J to 1 d.p

4 0

2 years ago

Read 2 more answers

What is the total entropy change if a 0.280 efficiency engine takes 3.78E3 J of heat from a 3.50E2 degC reservoir and exhausts i

babymother [125]

Answer:

$\Delta S=1.69J/K$

Explanation:

We know,

$\eta=1-\frac{T_2}{T_1}=1-\frac{Q_2}{Q_1}$ ..............(1)

where,

η = Efficiency of the engine

T₁ = Initial Temperature

T₂ = Final Temperature

Q₁ = Heat available initially

Q₂ = Heat after reaching the temperature T₂

Given:

η =0.280

T₁ = 3.50×10² °C = 350°C = 350+273 = 623K

Q₁ = 3.78 × 10³ J

Substituting the values in the equation (1) we get

$0.28=1-\frac{Q_2}{3.78\times 10^{3}}$

or

$\frac{Q_2}{3.78\times 10^3}=0.72$

or

$Q_2=3.78\times 10^3\times0.72$

⇒ $Q_2 =2.721\times 10^3 J$

Now,

The entropy change ( $\Delta S$ ) is given as:

$\Delta S=\frac{\Delta Q}{T_1}$

or

$\Delta S=\frac{Q_1-Q_2}{T_1}$

substituting the values in the above equation we get

$\Delta S=\frac{3.78\times 10^{3}-2.721\times 10^3 J}{623K}$

$\Delta S=1.69J/K$

7 0

3 years ago

Which statement best summarizes Gregor Mendel’s contribution to science?

Rama09 [41]

Hey there!

<span>Which statement best summarizes Gregor Mendel’s contribution to science?

Mendel is considered the "father of genetics". He did NOT increse the number of peas </span>
<span>produced by a single plant using cross-breeding techniques, discover grean peas and yellow peas, or invent the green pea by cross-breeding thousands of pea plants.

This means your answer is option D.

Hope this helps
Have a great day (:
</span>

8 0

3 years ago

Read 2 more answers

What is capacitance?

WARRIOR [948]

capacitance of any given capacitor is given by the formula,

C=Q/V

where C=capacitance,Q= charge and V=voltage

therefore from the formula capacitance is charge per unit voltage.

4 0

3 years ago

10 solve the following humeric problem - S. a What is the lift height of salu? T. object energy required to 25 kg to mass of a 1

Salsk061 [2.6K]

Mass=m=25kg
Height=h=10m
Acceleration due to gravity=g=10m/s^2

$\boxed{\sf E_P=mgh}$

$\\ \sf\longmapsto E_P=25(10)(10)$

$\\ \sf\longmapsto E_P=25(100)$

$\\ \sf\longmapsto E_P=2500J$

6 0

3 years ago