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Licemer1 [7]
3 years ago
12

An object of mass 2.5 kg has a momentum < 3, 6, 7 > kg m/s. At this instant the object is acted on a by a force < 50, 5

0, 100 > N for 5 x 10-3 s . What is the momentum of the object at the end of this time interval?
Physics
1 answer:
rosijanka [135]3 years ago
5 0

Answer:

The momentum of the object at the end is (3.25i+6.25j+7.5k)\ kg-m/s

Explanation:

Given that,

Mass of object = 2.5 kg

Momentum p= 3i+6j+7k

Force F=50i+50j+100k

Time t=5\times10^{-3}\ s

We need to calculate the momentum of the object at the end

Using formula of impulse

J=\Delta p

J=m\Delta v...(I)

J=F\times\Delta t....(II)

From equation (I) and (II)

F\times\Delta t=m\Delta v

F\times \Delta t=m(v_{f}-v_{i})

mv_{f}=F\times \Delta t+mv_{i}

Put the value into the formula

p_{f}=(50i+50j+100k)\times5\times10^{-3}+3i+6j+7k

p_{f}=0.25i+0.25j+0.5k+3i+6j+7k

p_{f}=(3.25i+6.25j+7.5k)\ kg m/s

Hence, The momentum of the object at the end is (3.25i+6.25j+7.5k)\ kg-m/s

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Simora [160]
Data D has the largest range.

Data A: 61-48=13
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You lift a 10-N physics book up in the air a distance of 1.0 m, at a constant velocity
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The book is lifted upward, but gravity points down, so the work done by gravity must be negative (so you can eliminate options 1 and 3).

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3 years ago
Time dilation means that
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3 years ago
Which choice correctly describes what happens during heating?
Masja [62]

Answer:

Option 4

Explanation:

During heating actually heat transfer takes place from a body at higher temperature to a body at lower temperature and the heat transfer takes place until both attain the same temperature  

Therefore heat transfer depends on the temperature of the systems

Now while comparing the thermal energies of the systems, if both the systems have same mass then the system which is at higher temperature has greater thermal energy when compared to the system which is at lower temperature

So in this case assuming that both the systems have same mass then the energy will leave the system with greater thermal energy and go into the system with less thermal energy as the system with greater thermal energy in this case will be at higher temperature and we are considering this assumption because thermal energy not only depends on temperature but also depends on mass of the system

7 0
3 years ago
3.
ratelena [41]

Answer:

1.84 kJ  (kilojoules)

Explanation:

A specific heat of 0.46 J/g Cº means that it takes 0.46 Joules of energy to raise the temperature of 1 gram of iron by 1 Cº.

If we want to heat 50 g of iron from 20° C to 100° C, we can make the following calculation:

Heat = (specific heat)*(mass)*(temp change)

Heat = (0.46 J/g Cº)*(50g)*(100° C -  20° C)

[Note how the units cancel to yield just Joules]

Heat = 1840 Joules, or 1.84 kJ

[Note that the number is positive:  Energy is added to the system.  If we used cold iron to cool 50g of 100° C water, the temperature change would be (Final - Initial) or (20° C - 100° C).  The number is -1.84 kJ:  the negative means heat was removed from the system (the iron).

8 0
2 years ago
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