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Mama L [17]
3 years ago
12

Desmond is a scientist working with a culture of bacteria. 2500 bacteria in a petri dish are growing at a rate of 3% per second.

Which expression represents the number of bacteria in the petri dish after t seconds? options : p=2500e.03t p=2500⋅(1.03)t p=2500.03t p=2500e1.03t
Physics
1 answer:
satela [25.4K]3 years ago
5 0

Answer:

P = 2500 (1.03)^t

Explanation:

The bacteria grow exponentially. The initial number is 2500, and the growth rate is 3%, so the expression is:

P = 2500 (1.03)^t

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4 0
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As shown in the figure below, a bullet is fired at and passes through a piece of target paper suspended by a massless string. Th
NikAS [45]

Answer:

M = 0.730*m

V = 0.663*v

Explanation:

Data Given:

v_{bullet, initial} = v\\v_{bullet, final} = 0.516*v\\v_{paper, initial} = 0\\v_{paper, final} = V\\mass_{bullet} = m\\mass_{paper} = M\\Loss Ek = 0.413 Ek

Conservation of Momentum:

P_{initial} = P_{final}\\m*v_{i} = m*0.516v_{i} + M*V\\0.484m*v_{i} = M*V .... Eq1

Energy Balance:

\frac{1}{2}*m*v^2_{i} = \frac{1}{2}*m*(0.516v_{i})^2 + \frac{1}{2}*M*V^2 + 0.413*\frac{1}{2}*m*v^2_{i}\\\\0.320744*m*v^2_{i} = M*V^2\\\\M = \frac{0.320744*m*v^2_{i} }{V^2}  ....... Eq 2

Substitute Eq 2 into Eq 1

0.484*m*v_{i} = \frac{0.320744*m*v^2_{i} }{V^2} *V  \\0.484 = 0.320744*\frac{v_{i} }{V} \\\\V = 0.663*v_{i}

Using Eq 1

0.484m*v_{i} = M* 0.663v_{i}\\\\M = 0.730*m

7 0
3 years ago
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Answer: "B" Changing Position

Great Question!

Explanation: <u><em>When a ball bounces to the ground it hits the ground with some energy. The amount of energy with which it hits the ground is kinetic energy. When it comes in the contact with the ground kinetic energy gets converted into potential energy. This potential energy again gets converted into kinetic energy and balls moves again from the ground and bounces multiple times. So, the ball ends up changing position</em></u>

<u><em /></u>

8 0
2 years ago
~choices below~
mart [117]
A is the correct answer
5 0
3 years ago
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MArishka [77]

Answer:

The last statement is false.

Explanation:

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