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Natalka [10]
3 years ago
11

All moving objects don’t have momentum A. True B. False

Physics
2 answers:
mestny [16]3 years ago
4 0

Answer:

No

Explanation:

Some objects gain momentum.

GREYUIT [131]3 years ago
4 0
  • All moving objects have momentum.
  • We know, momentum = mass × velocity
  • So, when an object is moving, it has velocity.
  • So, there is momentum.

<u>Answer</u><u>:</u>

<u>B.</u><u> </u><u>False</u>

Hope you could understand.

If you have any query, feel free to ask.

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In a thermally isolated environment, you add ice at 0°C and steam at 100°C. (a) Determine the amount of steam condensed (in g) a
kondor19780726 [428]

Answer:

 a) 11.2 g

   b) 3.73 g.

Explanation:

a) If we assume temperature of mixture to be 100°C , heat released by steam will be 11.2 x 540 = 6048 cals and heat gain gained by will be

79 x 80 + 79 x 1 x 100 = 14220 cals . Since former heat is less than later heat ,water will not be warmed up to 100°C. Let equilibrium temperature be t .  

Heat gained by water = 79 x 80 + 79 x 1 x t = 11.2 x 540 + 11.2( 100 - t )

t = 9.4°

amount of steam condensed = 11.2 g.

b) In this case, whole of water will be warmed up to 100°C as steam is much .heat required by water to warm up to boiling point

= 11.2 x 80 + 11.2 x 100 = 2016 cals

amount of steam condensed =  2016 / 540 = 3.73 g .  

3 0
3 years ago
2. An athlete of average size is hanging from the end of a 20 m long rope, which has a mass of 4 kg and is attached to a hook in
a_sh-v [17]

Answer:

  t = 0.319 s

Explanation:

With the sudden movement of the athlete a pulse is formed that takes time to move along the rope, the speed of the rope is given by

             v = √T/λ

Linear density is

           λ = m / L

           λ = 4/20

           λ = 0.2 kg / m

The tension in the rope is equal to the athlete's weight, suppose it has a mass of m = 80 kg

           T = W = mg

           T = 80 9.8

           T = 784 N

The pulse rate is

          v = √(784 / 0.2)

          v = 62.6 m / s

The time it takes to reach the hook can be searched with kinematics

          v = x / t

          t = x / v

          t = 20 / 62.6

          t = 0.319 s

7 0
3 years ago
How fast must a 1000 kg car be moving to have a kinetic energy of:
VMariaS [17]

Answer:

\mathrm{(a)}\: 2\: \mathrm{m/s}\\\mathrm{(b)}\: 20\: \mathrm{m/s}\\

Explanation:

The kinetic energy of an object is given by KE=\frac{1}{2}mv^2 where m is the mass of the object and v is the velocity of the object.

We can set up the following equations with the information given:

\mathrm{(a)}\: 2.0\cdot 10^3=\frac{1}{2}\cdot 1000\cdot v^2, \\v=\fbox{$2\: \mathrm{m/s}$}

For part B, we have the same equation, but kinetic energy is now 2.0\cdot 10^5.

Therefore:

\mathrm{(b)}\: 2.0\cdot 10^5=\frac{1}{2}\cdot 1000\cdot v^2, \\v=\fbox{$20\: \mathrm{m/s}$}.

6 0
3 years ago
You apply the same force to two objects. Object 1 has mass M and object 2 has mass 5M. The acceleration of object 2 is
Hitman42 [59]

five times that of object l

3 0
3 years ago
A 4.00 µf capacitor is connected to a 12.0 v battery.
atroni [7]
(a) The capacitance of the capacitor is:
C=4 \mu F=4 \cdot 10^{-6}F
and the voltage applied across its plates is
V=12.0 V

The relationship between the charge Q on each plate of the capacitor, the capacitance and the voltage is:
C= \frac{Q}{V}
and re-arranging it we find the charge stored in the capacitor:
Q=CV=(4 \cdot 10^{-6} F)(12.0 V)=4.8 \cdot 10^{-5} C

(b) The electrical potential energy stored in a capacitor is given by
U= \frac{1}{2}CV^2
where C is the capacitance and V is the voltage. The new voltage is 
V=1.50 V
so the energy stored in the capacitor is
U= \frac{1}{2}(4 \cdot 10^{-6} F)(1.50 V)^2=4.5 \cdot 10^{-6} J
3 0
3 years ago
Read 2 more answers
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