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3 years ago

A train travels 25km in 5 hrs. How fast is the train going?

Physics

1 answer:

iren [92.7K]3 years ago

8 0

Answer: 5km per hour

If the train is going 25km in 5 hours, you can figure out how many kilometers per hour it is traveling by dividing 25km by the 5 hours.

25/5 = 5km per hour

Explanation:

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A 69 g particle is moving to the left at 25 m/s . How much net work must be done on the particle to cause it to move to the righ

LekaFEV [45]

Answer:11.59 J

Explanation:

Given

mass of Particle $m=69 gm$

Initially Particle moves towards left $v_1=25 m/s$

Final velocity of Particle is towards Right $v_2=31 m/s$

According to Work Energy theorem

Work done by all the Forces=change in Kinetic Energy

Work done by Force $=\frac{mv_2^2}{2}-\frac{mv_1^2}{2}$

$W=\frac{69\times 10^{-3}}{2}\left [ 31^-25^2\right ]$

$W=\frac{69\times 10^{-3}}{2}\left [ 961-625\right ]$

$W=11.59 J$

5 0

4 years ago

A man climbs a ladder. Which two quantities can be used to calculate the energy stored of the man at the top of the ladder.

Dvinal [7]

Answer:The answer must be The weight of the man and the vertical distance moved.

Explanation: you calculate it by the force you applied times the distance you moved

8 0

3 years ago

A very long cylinder, of radius a, carries a uniform polarization P perpendicular to its axis. Find the electric field inside th

Juliette [100K]

Answer:

For electric field inside cylinder, check image 02 attached

For electric field outside cylinder, check image 03 attached

Explanation:

Let's consider the polarized cylinder as superposition of two cylinders with opposite,equal, uniform charge densities in a way shown in the figure in the "image 01"d attached ;

In general, if we have an object with polarization (P¬) , then we have to take two objects with similar shape to the system, with opposite, equal, and uniform charge densities and then we super-impose these two objects in such a way that the total dipole moment of this superimposed system is equal to the total dipole moment of original system.

Now, we can take the super- imposed system as equivalent to the original system for calculating electric field and potential.

Therefore,

For the electric field inside the cylinder, check the solution in "image 02" i attached

For the electric field outside the cylinder, check, "image 03" i attached.

4 0

3 years ago

Read 2 more answers

The nucleus of the atom contains 8 protons and 9 neutrons. The atom is electrically

Alinara [238K]

Answer:

an atom has 8 electrons

Explanation:

3 0

3 years ago

A book of mass 3 kg rests on a plank. You tilt one end of the plank and slowly increase the angle of the tilt. The coefficient o

bonufazy [111]

Answer: 24.7 degrees Max

Explanation:

m*g = 3 * 9.8 = 29.4 N. = Wt. of book. 

 Fp = 29.4*sin A = Force parallel to the plank. 

 Fn = 29.4*Cos A = Force perpendicular to the plank. 

 Fs = u*Fn = 0.46*29.4*Cos A  Fp-Fs = m*a

 29.4*sin A - 0.46*29.4*Cos A = m*0 = 0

 29.4*Sin A = 0.46*29.4*Cos A

 Sin A = 0.46*Cos A

 Divide both sides by Cos A:

 Sin A/Cos A = 0.46

 Replace Sin A/Cos A with Tan A:

 Tan A = 0.46

 A = 24.7 degrees Max.

8 0

3 years ago