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4 years ago

Which substance is a combination of different atoms?

Physics

1 answer:

zvonat [6]4 years ago

6 0

Answer:

Heterogeneous

Explanation:

A chemical substance is composed of one type of atom or molecule. A mixture is composed of different types of atoms or molecules that are not chemically bonded. A heterogeneous mixture is a mixture of two or more chemical substances where the various components can be visually distinguished.

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A binary star system consists of two stars of masses m1 and m2. The stars, which gravitationally attract each other, revolve aro

mote1985 [20]

Answer: $a_{2}=\frac{m_{1}}{m_{2}} a_{1}$

Explanation:

The rest of the question is below:

Find a2, the magnitude of the centripetal acceleration of the star with mass m2.

Assuming both stars are describing a uniform circular motion, their acceleration vector is directed towards the center of mass of the system (that's why it's called centripetal acceleration).

Now, according to Newton's 2nd law, the force $F$ is directly proportional and in the same direction as the acceleration.

For $m_{1}$ :

$F_{1}=m_{1}a_{1}$

For $m_{2}$ :

$F_{2}=m_{2}a_{2}$

If the centripetal force is the same for both stars:

$F_{1}=F_{2}$

$m_{1}a_{1}=m_{2}a_{2}$

Isolating $a_{2}$ :

$a_{2}=\frac{m_{1}}{m_{2}} a_{1}$

8 0

3 years ago

Write this number in standard notation. 4.702 x 10–4

iragen [17]

Move the decimal three places to the left -> .0004702

6 0

4 years ago

Read 2 more answers

The _______ is responsible for absorbing the most UV radiation.

Lorico [155]

_____Mesosphere_____

5 0

3 years ago

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Determine the kinetic energy of the ball immediately after it is hit. (You must provide an answer before moving to the next part

earnstyle [38]

The question is incomplete. Here is the complete question.

A baseball palyer hits a 5.1 oz baseball with an initial velocity of 140ft/sat an angle of 40° with the horizontal as shown. Determine

a) The kinetic energy of the ball immediately after it is hit

b) The kinetic energy of the ball when it reaches its maximum height

c) The maximum height above the ground reached by the ball.

Answer: a) KE = 131.64 J

b) KE = 0

c) h = 126 ft

Explanation: Kinetic energy is the energy an object posses due to its motion. It can be calculated as $KE=\frac{1}{2}mv^{2}$

a) Kinetic energy's unit is Joule. So, we have to transform ounce in kg and ft/s in m/s for the units to correspond:

m = 5.1(0.02835)

m = 0.1445 kg

v = 140 ft = 42.67 m/s

Then, kinetic energy is

$KE=\frac{1}{2}(0.1445)(42.67)^{2}$

KE = 131.64 J

Kinetic energy immediately after the ball is hit is 131.64 J.

b) At its maximum height, the ball has its highest potential energy. Because of the law of conservation of energy, when potential energy is maximum, kinetic energy is minimum and vice-versa. So, at the maximum height, kinetic energy is 0.

c) This type of motion is projectile motion. The maximum height on a projectile motion can be determined by

$v_{y}^{2}=v_{0y}^{2}-2g\Delta y$