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larisa86 [58]
3 years ago
15

A ball is thrown vertically upward with an initial velocity of 25 m/s. What is its velocity after 3 seconds in the air? (assume

air resistance is negligible)
Physics
1 answer:
klasskru [66]3 years ago
4 0

Answer:

v = -5 m/s

Explanation:

It is given that,

The initial velocity of the ball, u = 25 m/s

We need to find its velocity after 2 seconds in the air.

Let v is the velocity of the ball after 2 seconds. Using equation of motion to find it.

v = u + at

Here, a = -g

v = u -gt

Putting all the values,

v = 25 - (10)(3)

= 25-30

= -5 m/s

So, the velocity of the ball after 3 seconds is 5 m/s and it is in downward direction.

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A key lime pie in a 10.00 inch diameter plate is placed upon a rotating tray. Then, the tray is rotated such that the rim of the
juin [17]

Answer:

The angular distance in revolution is revolution = 3.439 \ revolution

The angular distance in radians  is \theta_{rad}= 21.6 \ radians

The angular distance in degrees  is   \theta =1238.04^o

The angular size is   Z = \frac{2}{9} \pi \ radians

Explanation:

From the question we are told that  

  The diameter is d = 10 \ inches

   The distance moved by the rim is D = 108 \ inches

Generally the circumference of the pie plate is mathematically represented as

               C = \pi d

Substituting the values  

          C = 10 *3.142

             = 31.42 \  inches

The number resolution carried out by the pie plate is evaluated as

           revolution  = \frac{D}{C}

Substituting value

            revolution  = \frac{108}{31.4}

                              revolution = 3.439 \ revolution

The angular  distance \theta_{rad} is mathematically evaluated as

                \theta_{rad} = \frac{D}{r}

             Where r is the radius which is mathematically evaluated as

                        r = \frac{d}{2} = \frac{10}{2}  = 5 \ inches

Substituting  this into the equation for angular distance

                      \theta_{rad} = \frac{108}{5}

                              \theta_{rad}= 21.6 \ radians

The angular distance traveled in degrees is

                   \theta =  3.439 *360

                      \theta =1238.04^o

When  the pie is cut into 9 equal parts

The angular size would be mathematically evaluated as

                         Z = \frac{2\pi}{9}

                           Z = \frac{2}{9} \pi \ radians

                             

7 0
4 years ago
nder process​ costing, costs assigned to goods sold are transferred to the Cost of Goods Sold account from the​ ________. A perp
Reika [66]

Answer:

B

Explanation:

Under process​ costing, costs assigned to goods sold are transferred to the Cost of Goods Sold account from the​  Finished goods inventory account

The simple reason can be that Earlier than they are transferred to cost of goods sold account and being sold, they are finished goods right before it. So, they are actually transferred from finished goods inventory account only.

6 0
3 years ago
Think about the various energy sources such as the sun, fossil fuels, water, wind, and nuclear power. What is the energy source
lakkis [162]

Answer:

<em>The energy source that powers my home is gotten from burning of fossil fuels.</em>

<em>No! I do not like this energy source.</em>

<em>I personally would prefer solar source of electricity</em>

<em></em>

Explanation:

<em>Fossil fuels are fuels gotten from the decomposition of dead organisms over time, under intense heat and pressure</em>. They are usually found buried beneath the earth's crust where they have been formed and trapped.

Most electricity generating stations generate electricity by burning fossil fuels like natural gas and gasoline to generate electricity. <em>The problem with fossil fuels are the various part that they play in increasing carbon footprints in the atmosphere. The excess carbon in the atmosphere has been a major contributor to the global warming of planet Earth.  </em>

My preference for solar energy source is first due to its abundance unlike the fossil fuels that are already diminishing in storage beneath the earth's crust. Also, <em>solar energy is a clean source of energy that does not leave any damage on earth from its use</em>. It also promises to be a cheap source of power in the future with advances in solar technologies.

8 0
3 years ago
On an icy road, a 1100 kg car moving at 55 km/h strikes a 480 kg truck moving in the same direction at 37 km/h . The pair is soo
statuscvo [17]

Answer:

Speed of the wreckage = 49.29 km/hr

Explanation:

This question is solved simply by using the conservation of momentum law.

The momentum of the three moving bodies are calculated below:

Momentum of Car 1 : 1100 * 55 = 60500 kg.km/hr

Momentum of Truck : 480 * 37 = 17760 kg.km/hr

Momentum of Car 2 : 1300 * 49 = 63700 kg.km/hr

Total mass of all three vehicles: 1100 + 480 + 1300 = 2880 kg

The final momentum equals the initial momentum if it is conserved. Thus we have the following equation:

Final Momentum = Initial Momentum

Final Velocity * Total mass = Momentum of all three vehicles combined

Final Velocity * 2880 = 60500 + 17760 + 63700

Final Velocity = 49.29 km/hr

7 0
4 years ago
Read 2 more answers
Does anyone know what the answers are?
baherus [9]

Answer:

Option (C) is the answer

Explanation:

may be it is possible if that we stand so far

4 0
3 years ago
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