(01.01 LC)Two objects of the same mass are in a room. At which of the
following distances will the greatest gravitational force be exerted
by one object on another?
O 2 m
O 4 m
O 6 m
O 8 m
Answers
Answer:
2m
Explanation:
The closer the objects are, the more gravitational force there is
Answer:
2m
Explanation:
its the shortest distance so its corect
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Answers
mass (m) = 0.120kginitial velocity (Vo) = 0distance traveled (s) = 1.25 m
We first calculate for the final velocity of the ball:
Vf^2 = 2gs + Vo^2
Vf^2 = 2(9.8m/s2)(1.25m)
Vf = 4.95 m/s
Impulse = m(Vf−Vo)
Impulse = 0.120(4.95)
Impulse = 0.59 Ns
To find the momentum of the ball before it hit the floor, we need to figure out its final velocity using kinematics.
Values we know:
acceleration(a) - 9.81m/s^2 [down]
initial velocity(vi) - 0m/s
distance(d) - 1.25m [down]
This equation can be used to find final velocity:
Vf^2 = Vi^2 + 2ad
Vf^2 = (0)^2 + (2)(-9.81)(-1.25)
Vf^2 = 24.525
Vf = 4.95m/s [down]
Now we need to find the velocity the ball leaves the floor at using the same kinematics concept.
What we know:
a = 9.81m/s^2 [down]
d = 0.600m [up]
vf = 0m/s
Vf^2 = Vi^2 + 2ad
0^2 = Vi^2 + 2(-9.81)(0.6)
0 = Vi^2 + -11.772
Vi^2 = 11.772
Vi = 3.43m/s [up]
Now to find impulse given to the ball by the floor we find the change in momentum.
Impulse = Momentum final - momentum initial
Impulse = (0.120)(3.43) - (0.120)(-4.95)
Impulse = 1.01kgm/s [up]
Answers
Problems with solar energy include the inability of current technology to capture the large amounts of the Sun's energy, the inability of current technology to store captured solar energy, and inconsistencies in the availability of the resource. Thus, the correct options are 1, 2, and 3.
What is the Solar energy?
Solar energy is the radiant light energy and the heat energy from the Sun which is harnessed using a wide range of technologies such as the solar power to generate electric energy, solar thermal energy, and the solar architecture.
Problems which are associated with the solar energy include the inability of current technology to capture the large amounts of the Sun's energy, the inability of current technology to store captured solar energy, and inconsistencies in the availability of the resource.
Therefore, the correct options are 1, 2, and 3.
Learn more about Solar energy here:
#SPJ1
large amounts of the Sun's energy
Well, it's true that large amounts of it get away ... our 'efficiency' at capturing it is still rather low. But the amount of free energy we're able to capture is still huge and significant, so this isn't really a major problem.
Second choice: the inability of current technology to store
captured solar energy
No. We're pretty good at building batteries to store small amounts, or raising water to store large amounts. Storage could be better and cheaper than it is, but we can store huge amounts of captured solar energy right now, so this isn't a major problem either.
Third choice: inconsistencies in the availability of the resource
I think this is it. If we come to depend on solar energy, then we're
expectedly out of luck at night, and we may unexpectedly be out
of luck during long periods of overcast skies.
Fourth choice: lack of demand for solar energy
If there is a lack of demand, it's purely a result of willful manipulation
of the market by those whose interests are hurt by solar energy.
Answers
Data;
- Power = 1200W
- Time/day = 10 mins
Power
The is the rate of energy used to time. It is the measure of expedience of energy.
a). How many minutes is the dryer used in a month.
Assuming there 30 days in a month;
This shows that the dryer is used 300 minutes in a month.
b). How many hours is the dryer used in a month.
To solve this problem, we simply need to convert the value of (a) from minutes to hours.
The dryer was used for a total of 5 hours in a month.
c). The power of the dryer in kilowatt.
To convert the power in watt to kilowatt, we divide by 1000.
The power in kilowatt is 1.2kw
d). How many kilowatt/hr of electricity used in a month.
The dryer consumes 6kw/h in a month.
e). If the town charges $0.15/kwh, the cost in a month
The cost of the dryer in a month is $0.9.
Learn more on power here;
5 hours
1.2 killowatt
6 killowatt hour
6*0.15=0.9
$0.9
Answers
A. 0°C
B. 0 C
C. 0°K
D. 0 K
Answers
Your answer is going to be 0 degrees Kelvin!
This is really sneaky. Of course it's going to be "Absolute Zero" ... the bottom of the Kelvin scale ... but what in the world is the difference between choice-C and choice-D ? ?
On the Kelvin scale, just to be different I guess, the unit of temperature is not called "the degree" Kelvin. On that scale, the unit is called "the Kelvin", and the temperature is called 'so many' "Kelvins".
So the correct choice is D ... "zero Kelvins".