All categories

3 years ago

Summarize the main ideas of Dalton’s atomic theory

1 answer:

4 0

Dalton's Atomic Theory had several main points, which are variously grouped into five statements : 1) All matter is made of atoms. 2) Atoms of a given element are identical in size, mass and chemical properties. 3) Atoms of different elements have different masses and properties.

You might be interested in

a trcuk weighs four times as much as a stationary car. if teh truck coasts into the car at 12 km/s and they stick toegther, what

Andrews [41]

Answer:

v=9.6 km/s

Explanation:

Given that

The mass of the car = m

The mass of the truck = 4 m

The velocity of the truck ,u= 12 km/s

The final velocity when they stick = v

If there is no any external force on the system then the total linear momentum of the system will be conserve.

Pi = Pf

m x 0 + 4 m x 12 = (m + 4 m) x v

0 + 48 m = 5 m v

5 v = 48

$v=\dfrac{48}{5}\ km/s$

v=9.6 km/s

Therefore the final velocity will be 9.6 km/s.

3 0

3 years ago

A motor does 1000J of work in 18 seconds. What is the power of the<br> motor?

solong [7]

Answer:

55.56 watt

Explanation:

Work (W) = 1000 J

time (T) = 18 sec

power (P) = ?

We know power is the rate of doing work so

p = w / t

= 1000 / 18

= 55. 56 watt

7 0

3 years ago

A pinball bangs against a bumper giving the ball a speed of 42cm/s if the ball has a mass of 50.0g what is the ball’s kinetic en

Ann [662]

Explanation:

<h3><u>Given</u><u>:</u><u>-</u></h3>

mass=50g

velocity=42cm/s

Kinetic energy

<h3><u>Solution</u><u>:</u><u>-</u></h3>

As we know that

${\boxed{\sf kinetic\:energy={\dfrac {1}{2}}mv^2}}$

Substitute the values

${:}\longrightarrow$ $\sf k.v={\dfrac {1}{{\cancel{2}}}}\times 50\times {\cancel{42}}^2$

${:}\longrightarrow$ $\sf k.v=50\times 21^2$

${:}\longrightarrow$ $\sf k.v=50×441$

${:}\longrightarrow$ $\sf k.v=22050MJ$

1Joule=1000milijoules
22050MJ= ${\dfrac {22050}{1000}}=22.05J$
=22J(Approximately)

$\therefore$ ${\underline{\boxed{\bf Kinetic\:energy=22Joule}}}$

7 0

3 years ago

The maximum speed with which you can throw a stone is about 25 m/s. Can you hit a window 50 m away and 13 m up from the point wh

Nookie1986 [14]

Answer:

no, the maximum height = 12.3m

Explanation:

The equation for the trajectory of the ball for a given angle can be derived from:

(1) $x=cos\phi v_0t$

and

(2) $y=-\frac{1}{2}gt^2 +sin\phi v_0t$

Combining equation 1 and 2:

(3) $y=xtan\phi -\frac{gx^2}{2cos^2\phi v_0^2}$

Taking the derivative:

(4) $\frac{dy}{d\phi}=\frac{xsec^2\phi}{v_0^2}(v_0^2-gxtan\phi)$

Setting equation 4 equal to zero to calculate the maximum angle:

(5) $\phi=tan^{-1}(\frac{v_0^2}{gx})$

Plugging equation 5 back into equation2 confirms, the trajectory can't reach the target. The maximum height is 12.3m.

3 0

3 years ago

Read 2 more answers

Which of the following best describes a mathematical wave

victus00 [196]

Answer: D:

A periodic disturbance of a medium

Explanation:

A wave can be Mathematically defined by periodic disturbance of a medium. That is, oscillations of the waves about a fixed position or change in position from the resting equilibrium position. The wave oscillate from equilibrium position with amplitude periodically.

3 0

3 years ago