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3 years ago

HELP ASAP!!!

Physics

1 answer:

butalik [34]3 years ago

8 0

Answer:

D. The acceleration after it leaves the hand is 10 m/s/s downwards

Explanation:

Vertical Throw

When an object is thrown upwards, it describes a special type of motion ruled only by gravity.

When the ball is launched, it has its maximum speed upwards. The acceleration of gravity is always the same because it's a constant value near our planet's surface. The object starts to lose speed since the acceleration of gravity is pointed downwards and makes the object stop in the mid-air at its maximum height, where the speed is zero. Then, the object starts to fall and regain speed, this time downwards until it reaches back the launching point at the very same speed it was launched, but in the opposite direction.

The time it takes to reach its maximum height is the same it takes to return to the catching point, 2 seconds later.

With all these concepts in mind, we state that:

D. The acceleration after it leaves the hand is 10 m/s/s downwards

The other options are not correct because:

A. The acceleration is never upwards

B. The acceleration is never 0

C. Both times are equal

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During a breath, the average human lung expands by about 0.50 l. part a if this expansion occurs against an external pressure of

saveliy_v [14]

Work, in thermodynamics, is the amount of energy that is transferred from one system to another system without transfer of entropy. It is equal to the external pressure multiplied by the change in volume of the system. It is expressed as follows:

W = PdV

Integrating and assuming that P is not affected by changes in V or it is constant, then we will have:

W = P (V2 - V1)

Substituting the given values:
P = 1.0 atm = 101325 Pa
(V2 - V1) = 0.50 L =
W = 101325 N/m^3 ( 0.50) (1/1000) m^3
W = 50.66 N-m or 50.66 J

So, in the expansion process about 50.66 J of work is being done.

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3 years ago

Why is the sun renewable but oil is non renewable?

DochEvi [55]

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3 years ago

The portion of a sound wave with higher-than-normal pressure is called a(n)________

Leokris [45]

Answer:

Condensation

Explanation:

Increased pressure is called condensation or compressions because they are regions of high air pressure whilst rarefractions are low air pressure.

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3 years ago

Assuming two hypothetical maps that each cover a standard 8.5 by 11-inch sheet of paper, the larger-scale map would cover a larg

sukhopar [10]

Answer:

b) false

Explanation:

The scale of a map is the ratio of a distance on the map to the corresponding distance on the ground. Scaling allow us to capture a large geographical area on a reduced platform while still retaining the relative sizes and positioning of places on the map to their real life sizes and positioning. If both maps cover a standard 8.5 by 11-inch sheet of paper, then the map with the smaller ratio will have the bigger geographical area.

To understand better, let us assume two geographical areas A and B. A is bigger than B. If we were to put them both on the same area of map paper, then we'll have to scale up the smaller geographical area B so as to fit into the map paper. This means that the geographical area with the smaller area B will have the larger scale on the map.

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3 years ago

Randall is 140 miles away from Gregory. They are traveling towards each other. If Gregory travels 4 mph faster than Randall and

mote1985 [20]

Answer:

8 mph, 12 mph

Explanation:

t = Time taken = 7 hours

x = Speed of Randall

x+4 = Speed of Gregory

The distance they both will travel together is 140 miles if they start at the same time.

$Distance=Speed\times time$

$(x+4)t+xt=140\\\Rightarrow (x+4)7+7x=140\\\Rightarrow 7x+28+7x=140\\\Rightarrow 28+14x=140\\\Rightarrow x=\dfrac{140-28}{14}\\\Rightarrow x=8\ mph$

The speed of Randall is 8 mph

The speed of Gregory is 8+4 = 12 mph

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3 years ago