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Dennis_Churaev [7]
3 years ago
13

Mechanical energy Is __________ when there are no forces causing an object to lose energy.

Physics
2 answers:
Sedbober [7]3 years ago
8 0
Conserved is the answer
nydimaria [60]3 years ago
5 0
B conserved...........
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How many moles of gas are in a 34.2 L container at 1 atm of pressure and 123℉?
slega [8]

Answer:

1.29 moles

0.753 moles

0.745 moles

Explanation:

PV=nRT

n=PV/RT

n=(1)(34.2)/(0.0821)(323.7)

n=1.29

n=PV/RT

n=(1)(22.4)=(0.0821)(362.15)

n=0.753

n=PV/RT

n=(1)(16.7)/(0.0821)(273.15)

n=0.745

In the ideal gas equation, T is measured in Kelvin.

4 0
3 years ago
a hunter 412.5m from a cliff moves a distance x towards the cliff and fires a gun. he hears the echo from the cliff after 2.2sec
Inessa [10]

Answer: 49.5 m

Explanation:

The speed of sound s is given by a relation between the distance d and the time t:

s=\frac{d}{t} (1)

Where:

s=330 m/s is the speed of sound in air (taking into account this value may vary according to the medium the sound wave travels)

d=412.5 m-x since we are told th hunter was initially 412.5 meters from the cliff and then moves a distance x towards the cliff

t=\frac{2.2 s}{2}=1.1 s Since the time given as data (2.2 s) is the time it takes to the sound wave to travel from the hunter's gun and then go back to the position where the hunter is after being reflected by the cliff

Having this information clarified, let's isolate d and then find x:

d=st (2)

412.5 m-x=(330 m/s)(1.1 s) (3)

Finding x:

x=49.5 m This is the distance at which the hunter is from the cliff.

3 0
3 years ago
The earth exerts the necessary centripetal force on an orbiting satellite to keep it moving in a circle at constant speed. Which
jenyasd209 [6]

Answer:

E) The centripetal force is always perpendicular to the velocity.

Explanation:

Due to gravity and inertia, the satellite follows a uniform circular motion. In this movement, the velocity is always tangent to the orbit and the centripetal force is directed towards the center. Therefore, there is no net acceleration in the same direction of velocity, which implies that it remains constant.

8 0
4 years ago
A 40 kg boy is moving upwards upwards in a lift with an acceleration of 2 m /s ^2 what would be the weight felt by him if measuu
neonofarm [45]

Answer:

<h2> 48kg</h2>

f = ma \\

w \:  =  \frac{f}{g}  \\

Explanation:

f \:  = ma \\ f - mg = ma \\ f = ma + mg \\ f = 40 \times 2 + 40 \times 10 \\ f = 480

w =  \frac{f}{g}  \\w =   \frac{480}{10}  \\ w = 48kg

5 0
3 years ago
A typical pencil has an average length of 15.0 cm and an average mass of 10.0 g. Assume the tip of the pencil does not slip as i
natita [175]

Answer:

α = 17.0 rad/s²

Explanation:

For this problem let's use the torque expression

         τ = I α

Torque is the product of force by the distance that is half the length of the pencil

        τ = F x

Let's use trigonometry

        sin 10 = x / (l / 2)

        x = l / 2 sin 10

        τ = mg l /2  sin 10

The moment of inertia of pencil that we approximate as a rod with the axis of rotation at one end

          I = 1/3 m L²

 We replace

          mg l / 2 sin 10 = 1/3 m l² α

           α = 3/2 g/l  sin 10  

Let's reduce the magnitudes to the SI system

            l = 15.0 cm = 0.150 m

           m = 10.0 g = 0.0100 kg

Let's calculate

            α = 3/2 9.8 / 0.150 sin 10

            α = 17.0 rad/s²

8 0
3 years ago
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