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ra1l [238]
3 years ago
6

Which option is an example of a physical property?

Physics
2 answers:
Galina-37 [17]3 years ago
7 0

Answer:

Examples of physical properties are: color, smell, freezing point, boiling point, melting point, infra-red spectrum, attraction (paramagnetic) or repulsion (diamagnetic) to magnets, opacity, viscosity and density. (HOPED THIS HELPED ;)

Explanation:

solniwko [45]3 years ago
5 0

This question is incomplete, so here is the complete question:

Which option is an example of a physical property? a. toxicity b. flammability c.pH d. freezing point

Answer: The correct answer is option d. freezing point.

Explanation:

A physical property is any that can be observed or measured without causing any change in the composition of matter, and thus we can be able to describe it.

In this category we can observe<u> texture, color, smell, density, etc. </u>

Each matter has three states: liquid, solid and gaseous, and all matter can exist in each of them.

The boiling point and the melting point are related to these changes in matter, as well as the freezing point.

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From a branch 35 m high, a 0.75 kg bird dives into a small fish tank containing
Bad White [126]

Answer:

ΔT = 1.22*10^-3 °C

Explanation:

First, you calculate the potential energy of the bird when it is at 35 m high. The potential energy is also the mechanical energy of the bird in this case.

U=mgh

m: mass of the bird = 0.75kg

g: gravitational constant = 9.8m/s^2

h: height = 35m

U=(0.75kg)(9.8m/s^2)(35m)=257.25\ J

All this energy is given to the water. You use the following formula in order to calculate the change in temperature:

Q=mc\Delta T

m: mass of the water = 50kg

c: specific heat of water = 4186 J/kg°C

Q is equal to U (potential energy of the bird) because the bird gives all its energy to water. By doing ΔT the subject of the formula you obtain:

\Delta T=\frac{Q}{mc}=\frac{257.25J}{(50kg)(4186J/kg°C)}=1.22*10^{-3}\ \°C

hence, the maximum rise in temperature is 0.00122 °C

7 0
3 years ago
Why is disagreement among scientists important to the progress of science? Facing disagreement forces scientists to prove their
mash [69]
Facing disagreement forces scientists to prove their theories more conclusively.
7 0
3 years ago
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Which choice can be correctly defined as “the sum of all charge in a closed system remains constant”?
Elena-2011 [213]

Answer:

Law conservation of charge (D)

Explanation:

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3 years ago
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Two identical billiard balls traveling at the same speed have a head-on collision and rebound. If the balls had twice the mass,
Vinvika [58]

Answer:

a) No difference

Explanation:

Since the billiard balls are identical , they have the same mass. Also they have the same speed

Since the angular momentum is conserved and the total energy is conserved ( if we assume elastic collision)

1/2 m1 * v i1² +1/2 m2 * v i1² = 1/2 m1 * v f1² +1/2 m2 * v f2²

where m= mass , vi= initial velocity , vf= final velocity

since m1=m2=m , vi1=vi2=vi

1/2 m1 * v i1² +1/2 m2 * v i1² = 1/2 m1 * v f1² +1/2 m2 * v f2²

m * v i² = 1/2 m (v f1² +v f2² )

vi² = 1/2(v f1² +v f2² )

since the 2 balls are indistinguishable from each other (they have identical initial mass and velocity) there is no reason for a preferential speed for one of the balls and therefore its velocities must be equal . Thus vf1=vf2=vf

therefore

v i² = 1/2(v f1² +v f2² ) = v i1² = 1/2* 2vf² = vf²

and thus

vi= vf

in conclusion, there is no difference in speed after the rebound

4 0
3 years ago
An energetic child runs forward and backward. It's motion is shown on the following graph of horizontal position x vs time t
Klio2033 [76]

Answer: 0.50 m/s

Explanation: it’s on khan academy this was the correct answer

6 0
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