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ICE Princess25 [194]
3 years ago
6

What information is required when calculating speed or acceleration?

Physics
1 answer:
Tomtit [17]3 years ago
7 0

distance spreed time

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"Some microbes<span> are used for medicinal production. One of the most important groups of medicines, antibiotics, is produced by fungi and bacteria. The name antibiotics means 'against life'. It is appropriate, because they attack bacteria and other unicellular organisms that are pathogenic for </span>humans<span>."

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3 0
3 years ago
True or false? Scientific laws can be expressed through a law that relates several variables.
Marina86 [1]

Answer:

True

Explanation:

Scientific laws are often written as expressions that contains variables and are laws that are binding themselves.

In science, laws are natural phenomenon that draws from careful observations that holds through following a series of detailed study. Within the range of assumed parameters, a law will always hold true.

Most laws in science are denoted using mathematical variables which helps to interpret them.

The variables shows the relationship between the different parts of the law.

For example, Newton's law of universal gravitation is expressed mathematically as shown below;

                          F  =  \frac{G m_{1} m_{2}  }{r^{2} }

where G, m and r are all variables.

  G is the universal gravitation constant

   m is mass

   r is the distance between them.

   F is the gravitational force.

Most scientific laws are often expressed in this format.

5 0
3 years ago
A car runs at a constant speed of 15ms-1 for 30secs, and then accelerates uniformly to a speed of 25ms-1 over a time of 20secs.
Otrada [13]

Answer:

a. Please find the attached velocity time graph of the car's motion created with Microsoft Excel

b. The total distance traveled by the car is 8,725 meters

c. The average speed of the car is 22.9605263 m/s

Explanation:

The given parameters of the motion are;

The initial speed of the car, v₁ = 15 m/s

The time during which the car runs at the initial speed, t₁ = 30 seconds

The new speed the car then accelerates at 'a₁' to, v₂ = 25 m/s

The duration it takes for the car to accelerate to the new speed = 20 seconds

The time during which the car runs at the initial speed = 300 seconds

The time it takes the car to be brought to rest with a deceleration, 'a₂' from the new speed (20 m/s) = 30 seconds

The final speed of the car at rest, v₃ = 0 m/s

The acceleration, a₁ = (v₂ - v₁)/t₁ = (25 - 15)/20 = 1/2 m/s²

The deceleration , a₂ = (v₃ - v₂)/t₁ = (0 - 25)/30 = -5/6 m/s²

a. Please find attached the drawing of the velocity time graph of the motion created with Microsoft Excel

b. The total distance traveled by the car, 'Δx', is given b the area under the velocity time graph as follows;

Area of trapezoid, A₁ = (320 + 300)/2 × 10 = 3,100

Area of rectangle, A₂ = 15 × 350 = 5,250

Area of triangle, A₃ = 1/2×30×25 = 375

The total area under the velocity time graph = A₁ + A₂ + A₃ = 3,100 + 5,250 + 375 = 8,725

The total area under the velocity time graph = The total distance traveled by the car, Δx = 8,725 meters

c. The average speed of the car is given as follows;

The \ average \  speed  \ of  \ the \  car, \overline v =\dfrac{\Delta x}{\Delta t}  = \dfrac{The \  total \  distance  \ traveled by \  the \  car}{The  \ total  \  time \  the \  car \ travels}

Where;

Δt = The total time during which the car travels

∴ The average speed of the car = 8,725 m/(380 s) = 22.9605263 m/s

4 0
3 years ago
Determine the mechanical advantage of a car jack that uses an input force of 30 N and provides an output force of 600 N. pls ans
Maslowich

Answer:

Mechanical Advantage of car jack is 20

4 0
3 years ago
Why is the Copernican Revolution significant? Check all that apply.
k0ka [10]

Answer:

2.Scientists discovered new evidence to support their theories.

3.Scientists discovered that old interpretations of data was incorrect.

4.Scientists used observations and mathematical data to solve problems in new ways.

Explanation: Here you go

6 0
3 years ago
Read 2 more answers
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