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mihalych1998 [28]
3 years ago
12

Playing catch with a friend in a moving train. When you toss the ball in the direction the train is moving, how does the speed o

f the ball appear to an observer standing at rest outside the train?
I understand basic relative motion, just the ball moving on another moving object confuses me!
Physics
2 answers:
likoan [24]3 years ago
5 0
Well it would simply appear faster because the speed of the ball and the speed of the train.
telo118 [61]3 years ago
5 0

Answer:

The speed of the ball appear faster when we observe it from ground frame at rest.

Explanation:

As we know that by relate motion concept

v_{AB} = v_A - v_B

here when ball is thrown in the direction of train motion with velocity "v" relative to the train then we will assume here that let say the train at that moment is running at speed v_T

now by above concept of relative velocity we will have

v = v_{ball} - v_T

now for the speed of ball

v_{ball} = v + v_T

so from this equation we can see that the actual speed of ball in ground frame will be more than the speed observed in train frame

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A wheel on a car is rolling without slipping along level ground. The speed of the car is 36 m/s. The wheel has an outer diameter
lutik1710 [3]

Answer:

The speed of the top of the wheel is twice the speed of the car.

That is: 72  m/s

Explanation:

To find the speed of the top of the wheel, we need to combine to velocities: the tangential velocity of the rotating wheel due to rotational motion (v_t=\omega\,R=\omega\,(0.25\,m)\,) - with \omega being the wheel's angular velocity,

plus the velocity due to the translation of the center of mass (v = 36 m/s).

The wheel's angular velocity (in radians per second) can be obtained using the tangential velocity for the pure rotational motion and it equals:\omega=\frac{v_t}{r} =\frac{36}{0.25} \,s^{-1}

Then the addition of these two velocities equals:

\omega\,R+v=\frac{36}{0.25} (0.25)\,\,\frac{m}{s} +36\,\,\frac{m}{s} =72\,\,\frac{m}{s}

7 0
4 years ago
A typical cell phone consumes an average of about 1.00 W of electrical power and operates on 3.80 V. (a) What average current do
dusya [7]

Answer:

0.06925 A

18000 J

Explanation:

V = Voltage = 3.8 V

P = Power = 1 W

t = Time = 5 hours

Power is given by

P=V^2I\\\Rightarrow I=\dfrac{P}{V^2}\\\Rightarrow I=\dfrac{1}{3.8^2}\\\Rightarrow I=0.06925\ A

The average current the phone draws from its battery is 0.06925 A

Energy is given

E=Pt\\\Rightarrow E=1\times 5\times 3600\\\Rightarrow E=18000\ J

The energy stored in a fully charged battery is 18000 J

4 0
3 years ago
A certain airport runway of length L allows planes to
PilotLPTM [1.2K]

The length of the new runway In terms of (L) is 4L.

<em />

<em>Your question is incomplete, it seems your question is missing the following information below;</em>

"In terms of (L) , what must be the length of the new runway?"

The given parameters;

  • length of the runway, = L
  • let the take off speed = V₁

For the newly designed planes;

the take off speed is double of the original = 2V₁

the acceleration for both take is constant = a

The take off speed for the given constant acceleration is given as;

v^2 = u^2 + 2as\\\\v^2 = 0 + 2as\\\\v^2 = 2as\\\\a = \frac{v^2}{2s} \\\\

The length of the new runway In terms of (L) is calculated as follows;

a =  \frac{v_1^2}{2s_1}  = \frac{v_2^2}{2s_2}  \\\\substitute \ the \ corresponding \ values \ for \ initial \ acceleration \ and \ new \\acceleration\\\\\frac{v_1^2}{2L}  = \frac{(2v_1)^2}{2s_2}\\\\2s_2v_1^2 = 2L(4v_1^2)\\\\s_2 = \frac{2L(4v_1^2)}{2v_1^2} = \frac{8Lv_1^2}{2v_1^2} = 4L

Thus, the length of the new runway In terms of (L) is 4L.

Learn more here: brainly.com/question/15206976

3 0
3 years ago
1. In your own words explain what happens at a subduction zone. 2. In your own words explain what happens at a mid-ocean ridge.
Papessa [141]

Answer:

1. The subduction zone serves as the meeting point for two tectonic plates.

2. At the Mid- Ocean ridge, decompression melting occurs.

3 What causes the magma to rise is the increase in pressure caused by collection of gases by the magma.

Explanation:

Subduction zone is define as a zone where tectonic plates ( an oceanic plate slides beneath a continental plate) meets and contributes to the rise of magma to the surface in geological sciences.

At the Mid - Oceanic ridge, decompression melting occurs. As mantle ascends beneath the mid-ocean ridge, less and less rock lies above it, so large pressure changes occur, which leads to melting. The melt is less dense than the solid, and rises to the surface to form the oceanic crust.

At the subduction zone the magma that is formed is usually made up of silica rich lava. Thick silica rich magma does not release the gasses very easily so they build up inside the magma chamber. As the gasses collect in the chamber, the pressure rises. It is possible for the pressure to rise so much that the chamber cannot contain the magma and it erupts explosively.

3 0
3 years ago
The diagram below shows a subduction zone where oceanic crust is sinking into the mantle underneath continental crust as two
Scrat [10]

Metal ores

Explanation:

in an area where subduction has occurred in times past, metal ores are likely to be found.

Metallic ores find subduction zone regions very favorable to crystallize out of a magma.

  • Ores have different modes of formation.
  • Typically, they are found in hydrothermal vents and black smokers of igneous intrusives.
  • These are igneous terrains where metallic sulfides and other minerals crystallize out of magmatic body.
  • Metals in magma usually have large sizes and do not partition easily in the melt.

At a subduction zone, partial melting of the subducting plate forces magma into nearby country rock as an intrusive and to the ocean floor where they form black smokers.

Learn more:

Rocks brainly.com/question/2740663

#learnwithBrainly

4 0
3 years ago
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