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3 years ago

In the table below,which statement would best fill the missing box under isolated systems?

Physics

1 answer:

Nostrana [21]3 years ago

3 0

Answer:

b-energy is not exchanged

Explanation:

An isolated system is a thermodynamic system in which neither energy nor matter is exchanged with the surroundings.

As such the best statement that will fill the box under an isolated system is that energy is not exchanged.

In an open system, both matter and energy are exchanged with the surrounding.
A closed system is one in which energy transfer is permissible but matter is not exchanged.
Energy cannot be created nor destroyed in any system. They are simply transformed.

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Two blocks are connected by a string over a pulley. The hanging block has a mass of 8-kg and the one on the plane has a mass of

jeka94

Answer:

Let f be force of friction on the blocks kept on inclined plane. T be tension in the string

For motion of block on the inclined plane in upward direction

T - m₁gsin40 - f = m₁a

f = μ m₁gcos40

For motion of hanging block on in downward direction

m₂g - T = m₂ a

Adding to cancel T

m₂g - - m₁gsin40 - μ m₁gcos40 = a ( m₁+m₂ )

a = g (m₂ - - m₁sin40 - μ m₁cos40) / ( m₁+m₂ )

Putting the values

a = 9.8 ( 4.75 - 2.12-1.045) / 7.6

2.04 m s⁻²

M₂ will go down and M₁ will go up with acceleration .

Explanation:

7 0

3 years ago

The magnitude of the force involved in a certain collision (measured in newtons) is equal to the change in momentum (measured in

Vinvika [58]

Answer:

The time-interval of the collision is $t=\frac{{\Delta}p}{F}$

Explanation:

As given the force is equal to the rate of change of momentum. Mathemticaly this is:

$F=\frac{dp}{dt}.$

We can rearrange this equation to solve for ${\delta}t$ which gives

$t=\frac{{\Delta}p}{F}$

which is our answer.

In words this means the time interval is equal to the momentum change in that interval divided by the force applied that caused this momentum change.

4 0

3 years ago

Which would be best categorized as heat transfer by convection?

pantera1 [17]

Answer:

Explanation:

there are three modes of heat transfer which are

conduction
convection
radiation

Conduction is a mode of heat transfer in solid materials

Convection refers to a mode of heat transfer of fluids in motion.

Radiation occurs when heat moves as energy waves in form of infrared radiation. The energy from the sun reaches us by radiation.

From the list of options;

option A refers prevention of heat transfer by radiation

option B refers to noodles rising and falling in a poy of boiling water. The path which the noodles move shows the convective path of the fluid.

option C refers to heat transfer by conduction

Option D refers to oth convection and radiation as modes of heat transfer.

option B best describes heat transfer by convection

6 0

3 years ago

When you take your 1900 kg car out for a spin, you go around a corner of radius 53 m with a speed of 13 m/s. If the co-efficient

V125BC [204]

Answer:

Yes, you would be safe without skidding off

Explanation:

In this situation the sum of forces on the car would be:

$F_f = m*\frac{V^2}{R}$

$F_f = 1900*\frac{13^2}{53}$

$F_f = 6058.5N$

And the maximum friction force is:

$F_fmax = \mu*N$

$F_fmax = \mu*m*g$

$F_fmax = 0.75*1900*10$

$F_fmax = 14250N$

Since the required force is smaller than the maximum force, we can say it will not skid off

8 0

4 years ago

1. Swordfish are capable of stunning output power for short bursts. A 650 kg swordfish has a cross-sectional area of 0.92 m2 and

Oksana_A [137]

Answer:

$P_{sp}=178.4W/kg$

Explanation:

From the question we are told that:

Mass of fish $m_f=650kg$

Cross-sectional area $A=0.92 m^2$

Drag coefficient of $\mu= 0.0091$

Seawater density $\rho= 1026 kg/m^3.$

Speed of Fish $v=30 m/s$

Generally the equation for Drag force F_d is mathematically given by

$F_d = \mu * \rho *A v^2 /2$

$F_d = 0.0091* 0.92* 1026* 30^2/2 \\F_d= 3865. 35 N$

Generally the equation for high speed Power $P_{sp}$ is mathematically given by

$P_{sp}=3865*35*\frac{v}{m_f}$

$P_{sp}=F_d*35*\frac{30}{650}$

$P_{sp}=178.4W/kg$

5 0

3 years ago