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vampirchik [111]
3 years ago
8

The student hung the plastic strip over a wooden rod

Physics
1 answer:
dimaraw [331]3 years ago
3 0

Answer:

The main force in play here is weight W, or m*g (where m is Mass and g is Gravity) that make up the main force acting downwards. This could also be referred to as the normal force.

Explanation:

From what we can see the plastic strip is at a certain angle. To which other forces, such as: friction, pull and the ones mentioned above come into play in this question.

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According to the picture, which is the least dense?
alexdok [17]

Answer:

a the chess peice

Explanation:

my head

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3 years ago
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Phase change from a liquid to a solid is what type of property change
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It is to freeze an object
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A ball is thrown horizontally from the top of a building 21.8 m high. The ball strikes the ground at a point 101 m from the base
riadik2000 [5.3K]

Answer:

t=2.10 s

u= 47.40 m/s

Explanation:

given that

h= 21.8 m

x= 101 m

g=9.8 m/s²

Lets take horizontal speed of  ball = u m/s

The vertical speed of the car at initial condition is zero ( v= 0).

We know that

h=vt+\dfrac{1}{2}gt^2

v= 0 m/s

h=\dfrac{1}{2}gt^2

now by putting the values

21.8 = 1/2 x 9.8 x t²

t=2.10 s

This is time when ball was in motion.

Now in horizontal direction

x = u .t

101 = u x 2.1

u= 47.40 m/s

6 0
2 years ago
Rebecca heated 50mL of water from 0 degrees Celsius to 60 degrees Celsius. How much energy did she use to heat the water? Rememb
kramer

Answer:

12552 J or 3000 calories

Explanation:

Q = m × c × ∆T

Where;

Q = amount of heat energy (J)

m = mass of water (g)

c = specific heat capacity (4.184 J/g°C)

∆T = change in temperature

For 50mL of water, there are 50g, hence, m = 50g, c = 4.184 J/g°C, initial temperature = 0°C, final temperature = 60°C.

Q = m × c × ∆T

Q = 50 × 4.184 × (60 - 0)

Q = 209.2 × 60

Q = 12552 J

Hence, the amount of heat energy used to heat the water is 12552 J or 3000 calories

3 0
3 years ago
The picture below shows a person swinging a yo-yo in a circle. Which vector shows the velocity of the yo-yo at this moment?
igor_vitrenko [27]
C, at this moment it is directly 90 degrees to the right and is only travelling downwards
6 0
2 years ago
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