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Tanzania [10]
3 years ago
13

Two children stand on a platform at the top of a curving slide next to a backyard swimming pool. At the same moment the smaller

child hops off to jump straight down into the pool, the bigger child releases herself at the top of the frictionless slide.
(i) Upon reaching the water, how does the kinetic energy of the smaller child compare with that of the larger child?

a.It is greater. b.It is less. c.The two energies are equal.

(ii) Upon reaching the water, how does the speed of the smaller child compare with that of the larger child is?

a.It is greater. b.It is less. c.The two speeds are equal.

(iii) During their motions from the platform to the water, how does the average acceleration of the smaller child compare with that of the larger child? a.It is greater. b.It is less. c.The two accelerations are equal.
d.The First and third are wrong
Physics
1 answer:
IgorC [24]3 years ago
6 0

Answer:

Explanation:

i )

In a conservative field like gravitational field , loss of potential energy  or work done , depends upon the initial and final point and not the manner in which 2 nd point has been reached . Since the initial and final point is same in both the cases of straight and curved path , final velocity will remain same for both of them .

Hence , due to increased mass of larger child , his kinetic energy will be greater .

ii ) Since the initial and final point is same in both the cases of straight and curved path , final velocity will remain same for both of them .

iii ) Smaller child undergo free fall , therefore , he will fall with acceleration g . The larger child falls on curved path . So , he will have only a component of

vertical g at any moment  . hence average acceleration  will be less.

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3 0
3 years ago
Which two types of simple machines can be found in a bicycle? lever and wheel and axle pulley and wedge wedge and wheel and axle
insens350 [35]

Answer:

A). A Lever and Wheel and Axle.

Explanation:

1. A wheel axle is most obvious, as the wheels are connected via a chain and axle with spokes. This helps keep the wheels moving forward with less effort than walking.

2. A Lever is used to help Balance you as you ride the bike. Without it, you would tip over, and lose all the momentum you had gained up until that point.

3. (I took the test on e2020)

5 0
3 years ago
Read 2 more answers
Following are the different layers of the Sun's atmosphere. Rank them based on the order in which a probe would encounter them w
Ghella [55]

Answer:

Sequence of layers to encounter while travelling from Earth to the surface of the sun are:

Option (A) - Corona

Option (C) - Chromosphere

Option (B) - Photosphere

Explanation:

  • Corona- It represents the extreme outer region of the surface of the sun. It is normally not visible because of the light emitted from the sun. So it is difficult to be seen from the naked eye, but it can be seen during the time of total solar eclipse. The temperature in this region is about several million degrees.
  • Chromosphere- It is a layer that lies between the Corona and the Photosphere. This layer has a thickness of about 2000 kilometers and the temperature in this layer ranges from about 6000°C to 20,000°C.
  • Photosphere- This layer is the bright visible layer of the sun which is comprised of plasma and dark and cool sunspots, that forms on the sun due to the emerging of the magnetic field of the sun from its surface.

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3 0
3 years ago
A meter stick is found to balance at the 49.7-cm mark when placed on a fulcrum. When a 65.5-gram mass is attached at the 21.0-cm
Gnesinka [82]

Answer:

113.53 g

Explanation:

Please see attached photo for explanation.

In the attached photo, M is the mass of the meter stick.

The value of M can be obtained as shown below:

Clockwise moment = M × 10.5

Anticlockwise moment = 65.5 × 18.2

Anticlockwise moment = Clockwise moment

65.5 × 18.2 = M × 10.5

1192.1 = M × 10.5

Divide both side by 10.5

M = 1192.1 / 10.5

M = 113.53 g

Thus, the mass of the meter stick is 113.53 g

7 0
2 years ago
you are pushing a friend in a wagon.you push with a force of 40N. your friend and wagon together have a mass of 80kg. ignoring f
hram777 [196]

Answer:

a= 0.5 m/s^2

Explanation:

3 0
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