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3 years ago

What are the prediction made by the second and third apparitions?

Physics

1 answer:

julsineya [31]3 years ago

3 0

This is too late too answer?

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Pilings are driven into the ground at a building site by dropping a 2250 kg object onto them. What change in gravitational poten

den301095 [7]

Answer: 324.135 kJ

Explanation:

Given

Mass of dropping is $m=2250\ kg$

The initial height of dropping is $h_1=16\ m$

The final height of dropping $h_2=1.3\ m$

Gravitational potential energy is the function of height i.e.

$\Rightarrow \text{G.E.}=mgh$

Change in Gravitational Energy is

$\Rightarrow \Delta \text{G.E.}=mg(h_1-h_2)=2250\times 9.8\times (16-1.3)\\\\\Rightarrow \Delta \text{G.E.}=3,24,135\ J\approx 324.135\ kJ$

5 0

3 years ago

A student was given a sample of crude acetanilide to recrystallize. The initial mass of the the crude acetanilide was 166 mg. Th

padilas [110]

Answer:

The percentage of mass recover from recrystallization = 24.69 %

Explanation:

Given that

Initial mass of crude acetanilide = 166 gm

The mass after recrystallization = 125 gm

The mass recover from recrystallization= 166 - 125 gm

The mass recover from recrystallization= 41 gm

The percentage of mass recover from recrystallization can be find as

$percentage\ of\ mass\ recover\ from\ recrystallization\ =\dfrac{166-125}{166}$

The percentage of mass recover from recrystallization = 24.69 %

4 0

3 years ago

A cart of mass 20 kg, initially at rest, is pushed with a net force of 40 N on a flat surface. If the cart is pushed 5 m, what i

bixtya [17]

Using the theorem of kinetic energy
1/2mVf² - 1/2mVi²= WF + Wp, Wp=0
WF = F. AB, AB=5m and F= 40N, m=20kg
so the final kinetic is KEf= 1/2mVf² = WF =<span>F. AB= 40*5=200J
</span>
the final velocity is 1/2mVf² <span>=200, implies Vf= sqrt(20)=2sqrt(5)m/s</span>

3 0

3 years ago

Joan wants to test if salt lowers the temperature at which water boils.

ohaa [14]

In order to build a hypothesis, Joan should take an educated guess at what the effect of adding salt to the water will be on the water's boiling point. For example, the hypothesis may be,"The boiling point will increase". This hypothesis is one that can be verified or rejected via experimentation. The next step for Joan would be to set up an experiment to test this hypothesis.

6 0

3 years ago

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During which change of state do atoms lose energy? sublimation freezing boiling melting

Lorico [155]

Answer:

B) freezing

Explanation:

I just took the test on Edgenuity

3 0

3 years ago

Read 2 more answers