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AlladinOne [14]

3 years ago

12

You drop a glass on the floor and it shattters chemical or physical change ?

2 answers:

Sati [7]3 years ago

7 0

This describes a physical change. The glass shattering changes its physical shape and appearance only, as it retains its chemical composition.

Ket [755]3 years ago

3 0

This is Physical change.

Hope this helps!

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In our new car, we were able to drive 30 miles in a half an hour. From this information, we can determine the car's

Nonamiya [84]

I am pretty sure that according to the<span> information represened above, we can determine the car's </span><span>speed. It is usual thing in physics tasks and when we are provided with such values, we can immediately reveal the characteristic of the speed. Hope it helps!</span>

6 0

3 years ago

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What is the ﬁnal equilibrium temperature when 12 g of milk at 7◦C is added to 175 g of coﬀee at 69◦C? Assume the speciﬁc heats o

lina2011 [118]

Answer:

ﬁnal equilibrium temperature is 65.02 ◦C

Explanation:

Given data

milk = 12 g

temp milk = 7◦C

coffee = 175 g

coffee temp = 69◦C

to find out

ﬁnal equilibrium temperature

solution

we apply here equilibrium condition i.e m c ΔT

milk mass × c × ΔT = coffee mass × c × ΔT

12 × 1 × (T- 7) = 175 × 1 × ( 69- T)

12T - 84 = 12075 - 175 T

187 T = 12159

T = 65.02

so ﬁnal equilibrium temperature is 65.02 ◦C

3 0

4 years ago

A worker drives a 0.554 kg spike into a rail tie with a 2.30 kg sledgehammer. The hammer hits the spike with a speed of 62.7 m/s

Goryan [66]

Answer:

Increase in total energy will be equal to the increase in the internal energy i.e $1130.246$ Joules

Explanation:

Given

Weight of sledge hammer $= 2.30$ kilogram

Speed of sledge hammer $= 62.7$ meter per second

Kinetic energy is equal to half the product of mass and velocity square

$K E = \frac{1}{2} mv^2$

Substituting the value of mass and velocity, we get -

$KE = 0.5 * 2.30 * 62.7^2\\KE = 4520.9835$

It is given that one fourth of the energy is converted into internal energy

One fourth of kinetic energy is equal to

$\frac{1}{4} * 4520.9835\\= 1130.246$

Increase in total energy will be equal to the increase in the internal energy i.e $1130.246$ Joules

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3 years ago

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Please ans both urgent

Tpy6a [65]

Answer:

d I guess not sure

b if down I guess

Explanation:

if worng then plz dont say anything as I am not sure about the ans

4 0

3 years ago

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Help, due in 10 minutes. Really confused. Thank you.

alexandr402 [8]

Answer: animal 4

Explanation: I think it is correct

6 0

3 years ago