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3 years ago

What was so significant about dalton discoveries

Physics

1 answer:

Zarrin [17]3 years ago

8 0

Answer:

Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.

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A car of mass 1000kg is travelling in an eastward ( x) direction with a constant speed of 20m/s. It then hits a stationary truck

Aleonysh [2.5K]

Answer:

4.33 m/s, 5 m/s

Explanation:

mass of car, m = 1000 kg

initial velocity of car, u = 20 m/s along east

mass of truck, M = 2 x mass of car = 2000 kg

initial velocity of truck, U = 0 m/s

After collision, the velocity of car is v and the direction is 30° North of east.

The velocity of truck is V and the direction is 60° South of east.

Use conservation of momentum along X axis.

m x u = m x v x Cos 30 + M x V x Cos 60

1000 x 20 = 1000 x v x 0.866 + 2000 x V x 0.5

20 = 0.866 v + V .... (1)

Use conservation of momentum along y axis

0 = m x v x Sin 30 - M x V x Sin 60

0 = 1000 x v x 0.5 - 2000 x V x 0.866

v = 3.464 V ..... (2)

Substitute the value of v in equation (1)

20 = 0.866 x 3.464 V + V

V = 5 m/s

v = 0.866 x 5 = 4.33 m/s

Thus, the final speed of car is 4.33 m/s and the final speed of truck is 5 m/s after the collision.

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3 years ago

explain why a circulatory system is important in meeting the needs of all cells throughout an animals body

Effectus [21]

Helps ur blood circulate, to ur head and ect helpin u leave

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3 years ago

Punishment is used to

dlinn [17]

Punishment is used to B. decrease behavior

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2 years ago

Consider the concepts of kinetic energy (KE) and gravitational potential energy (GPE) as you complete these questions. A ball is

Lena [83]

Answer:

When the ball is held motionless above the floor, the ball possesses only GPE energy.If the ball is dropped, its GPE energy decreases as it falls.If the ball is dropped, its KE energy increases as it falls.

Explanation:

If the ball is held motionless, then its kinetic energy is equal to zero, since kinetic energy depends on the velocity. And the ball is held above the ground, which means it possesses gravitational potential energy.

If the ball is dropped, its height will decrease, therefore its gravitational potential energy will decrease. Along the way, the ball will be in free fall, and therefore its velocity will increase, hence its kinetic energy.

$K = \frac{1}{2}mv^2\\U = mgh$

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3 years ago

As a light wave strikes a shiny surface like a piece of polished metal, it will be

ycow [4]

It will reflect because polished metal is like glass or water it’s shiny and smooth

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3 years ago