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pav-90 [236]
3 years ago
10

1.

Physics
1 answer:
Studentka2010 [4]3 years ago
3 0

Answer: net primary productivity

Explanation: i just took my test and this was correct!

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A rock is projected from the edge of the top of a building with an initial velocity of 12.2 m/s at an angle of 73° above the hor
Brrunno [24]

Answer:

7 s

Explanation:

u = Initial velocity of rock = 12.2 m/s

\theta = Angle of throw = 73^{\circ}

x = Displacement in x direction = 25 m

Displacement in x direction is given by

x=u\cos\theta t\\\Rightarrow t=\dfrac{x}{u\cos\theta}\\\Rightarrow t=\dfrac{25}{12.2\times \cos73^{\circ}}\\\Rightarrow t=7\ \text{s}

Time taken to reach the ground is 7 s.

4 0
3 years ago
Some of the minerals found in rocks dissolve in water as it flows over the rocks. would these minerals dissolve more quickly
densk [106]
A. Minerals would dissolve faster at the bottom of a waterfall than at a still pond because the water is more turbulent at the base of the waterfall.  The turbulent water has more energy and would facilitate faster dissolution of minerals. 

B. Minerals would dissolve faster in warmer water downstream because the warm water would speed up the rate of dissolution. 


C. Minerals in the sand would dissolve faster because the sand is in small grains and so more surface area is available for dissolution.  
7 0
3 years ago
4. A vehicle
Gnom [1K]

Answer:

Average acceleration, a=2.77\ m/s^2

Explanation:

Given that,

Initial velocity, u = 0 km/h

Final velocity, v = 100 km/h = 27.77 m/s

Time, t = 10 s

We need to find the average acceleration of the vehicle. It is given by the change in velocity divided by time. Som,

a=\dfrac{v-u}{t}\\\\a=\dfrac{27.77-0}{10}\\\\a=2.77\ m/s^2

So, its average acceleration is 2.77\ m/s^2.

5 0
4 years ago
An experiment on the earth's magnetic field is being carried out 1.00 m from an electric cable. What is the maximum allowable cu
Whitepunk [10]

Answer:

The allowed current in the cable is 1.15 A.

Explanation:

Given that,

Distance = 1.00 m

Suppose the magnetic field is 2.3\times10^{-5}\ T and  if the experiment is to be accurate to 1.0 %

We need to calculate the current

Using formula of magnetic field

B=\dfrac{\mu_{0}I}{2\pi r}

I=\dfrac{B\times2\pi r}{\mu_{0}}

Put the value into the formula

I=\dfrac{2.3\times10^{-5}\times2\times\pi\times1.00}{4\pi\times10^{-7}}

I=115\ A

If the experiment is to be accurate to 1.0%

Then,

We need to calculate the allowed current in the cable

I'=(1.0%)\times I

I'=\dfrac{1.0}{100}\times115

I'=1.15\ A

Hence, The allowed current in the cable is 1.15 A.

4 0
3 years ago
Lora (of mass 43.6 kg) is an expert skier. She starts at 3.6 m/s at the top of the lynx run, which is 67 m above the bottom. Wha
Likurg_2 [28]

Explanation:

As per the law of conservation of energy, the final mechanical energy of Lora is equal to its initial mechanical energy. So, when Lora is at the bottom of ski run then her potential energy will change into kinetic energy.

Hence,   E_{initial} = \frac{mv_{i}^{2}}{2} + mgh


              E_{final} = \frac{mv_{f}^{2}}{2}

Now, final kinetic energy that will be at the bottom of the ski run is as follows.

Let,          E_{k} = E_{final}

            E_{intial} = E_{final}

          E_{k} = \frac{mv_{i}^{2}}{2} + mgh


                   = \frac{(43.6 \times (3.6)^{2}}{2} + (43.6 \times 9.81 \times 67)

                   = 282.53 + 28656.97

                  = 28939.502 J

Thus, we can conclude that her final kinetic energy at the bottom of the ski run is 28939.502 J.

3 0
3 years ago
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