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3 years ago

A scientist tests the water in a local pond and finds that it has a pH of 7.9. What is true about the water sample?

Physics

1 answer:

SSSSS [86.1K]3 years ago

3 0

So the pH level of regular water is about 7.0 so since it is 7.9, it means the water is a little more basic

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A force of 55N accelerates a 7.5kg wagon at 5.3 m/s^2 along a road. How large is the frictional force?

Varvara68 [4.7K]

Answer:

Explanation:

A force of $55\text{ }N$ is acting on a wagon along the road. The wagon weights $7.5\text{ }kg$ . Acceleration of the wagon is given as $5.3\text{ }\frac{m}{s^{2}}$ .

Consider the block as the system, the forces acting are Frictional force, Gravitational force, Normal reaction and External force applied by us.

Gravitational Force and Normal Reaction cancel out each other.

Net External Force = Mass of system/wagon $\times$ Acceleration of wagon

$F_{ext}-F_{friction}=(7.5\text{ }kg)\times(5.3\text{ }\frac{m}{s^{2}})=39.75\text{ }N\\55\text{ }N-F_{friction}=39.75\text{ }N\\F_{friction}=15.25\text{ }N$

$F_{friction}$ has a negative sign because it opposes the motion of the wagon.

∴ Frictional Force = 15.25 N

4 0

3 years ago

The height of the empire state building is 318 m if a stone is dropped from the top of the building what is the stones velocity

lutik1710 [3]

79 m/s. A stone dropped from the top of the Empire State Building will have a velocity of 79 m/s just before it strikes the ground.

This problem is about free fall, to find the velocity of the stone before it strikes the ground we have to use the equation $v_{f}^{2}=v_{0}^{2}+2gh$ , the initial velocity of the stone is 0 m/s. Then:

$v_{f}^{2}=2gh$

$v_{f}=\sqrt{ 2gh}$

Solving the equation above with g = 9.8 m/s², and h = 318.0 m:

$v_{f}=\sqrt{ 2(9.8m/s^{2})(318.0m)}= 78.95 m/s$

$v_{f}$ ≅ 79 m/s

4 0

2 years ago

Narrow belts of high-speed winds that blow in the upper troposphere and lower stratosphere are known as

Drupady [299]

<h2>Jet Stream</h2>

Explanation:

Jet streams are the winds that flow in the upper levels of the atmosphere.
These are relatively narrow bands of strong wind.
These high-speed winds blow from west to east in jet streams.
Sometimes, the flow of wind shifts from north to south.
Jet streams follow the boundaries between hot and cold air.

3 0

2 years ago

A solid cylinder and a hollow cylinder of equal mass and radius are at rest at the top of an inclined plane. They are released s

andrezito [222]

Answer:

Solid cylinder

Explanation:

Solid cylinder will reach first

If radius of each cylinder is r

mass is m

then,

Moment of inertia I= dm $r^{2}$

Here d = measure as how close the mass is to the edge

Velocity of rolling cylinder is given by

v= $\sqrt} \frac{2gh}{1+d}$

where,

g= 9.8 m/s2

h= height from ground

So from formula of velocity we can say that velocity will be maximum if denominator is minimum i-e if k is of small value -- or in other word if mass is away from edge i-e if mass is closer to the center !

As all the mass in hollow cylinder is near the edge so k value will be higher for it and hence it will have low velocity value. So it will reach later as compared to the solid cylinder in which mass is closer to the center and hence k is greater for solid cylinder.

6 0

3 years ago

Name six processes that are often involved in scientific inquiry?

lukranit [14]

1.identification of the problem.2. observation.3.formulation of the hypothesis.4. experimentation.5. analysis of data.6. drawing your conclusion.

4 0

2 years ago

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