Include units with all of your answers. A 1.84 kg bucket full of water is attached to a 0.76 m long string.a. If you swing the bucket in a vertical circle, what is the minimum speed you must swing it so the water does not fall out at the top of the circle?
b. What is the magnitude of the tension in the string at the top of the circle if you are swinging it at 3.55 m/s?
c. What is the magnitude of the tension in the string at the bottom of the circle if you are swinging it at 3.37 m/s?
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What is gravitational field?
Objects with masses of 160 kg and a 460 kg are separated by 0.440 m. (a) Find the net gravitational force exerted by these objects on a 51.0 kg object placed midway between them. magnitude N direction -Select- B (b) At what position (other than infinitely remote ones) can the Sko kg object be placed so as to experience a net force of zero? m from the 460 kg mass
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Answer:
81.29 m/s
Explanation:
Given:
60°C = 333 K is cp = 1.007 kJ/kg·K.
at air inlet:
Pressure = 100 kPa
Temperature = 30°C
Velocity = 357 m/s
at air outlet:
Pressure = 200kPa
Temperature = 90°C
We can define the energy balance as:
-
= Δ
= 0
therefore, =
m + m
=m
+
(taking m common and cancelling it)
4 +
=
+
The velocity at the exit of a diffuser:
= [
+ 2
(
-
)
= [
+ 2 x 1000 x 1.007 x (30-90)
= 81.29 m/s
therefore, the velocity at the exit of a diffuser is 81.29 m/s
Answer:
Exit velocity = 498.3m/s
Explanation:
The energy balance for the system is given by:
Ein - Eout = ◇Esystem
Ein = Eout
Therefore
m' (h1 + V1^2/2) = m' (h2 + V2^2/2)
h1 + V1^2/2 = h2 + V2^2/2
The exit velocity will be:
V2 = [V1^2 + 2(h1 - h2)^0.5 = [V1^2 + 2(cp(T1 - T2)]^0.5
But cp = 1.007kJ/kg
V2 = [(357)^2 + 2(1.007)(90-30)(1000m^2/s^2)]^0.5
V2 = [127449 + 120840]^0.5
V2 = [248289]^0.5
V2 = 498.3m/s
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current (amps) in the wire that the coil is made out of.
That current is going to be determined by the voltage of the
battery or power supply that powers the magnet, and by the
resistance of the wire. So yes, the properties of the wire do
have a direct effect on the strength of the magnet. If you
tried to make an electromagnet with a coil of wet spaghetti,
it would work, but you would need a humongous power supply
to get any significant strength out of the magnet.
890 m/s 850 m/s 790 m/s 895 m/s 870 m/s
Car A
Car B
Car C
Car D
Car E
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The mass of each car is the same so car D will take the longest time to come to a full stop. Hence, option D is correct.
What is acceleration?
In mechanics, acceleration is a unit used to describe how quickly the velocity of an object varies in relation to time. The direction of the net force acting on an object determines its acceleration.
Since acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is another vector quantity. Acceleration is defined as the change in velocity vector over a time interval divided by the time interval.
According to the question, we want to determine which automobile will take the longest to fully stop because we know that each one has the same mass and the same velocity. Here, we can assume that all the vehicles slow down uniformly, thus the vehicle traveling at the maximum speed will take the longest to come to a complete stop.
To get more information about acceleration :
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Answer: Car D.
Explanation:
We know that each car has the same mass, and knowing the velocity of each car, we want to know which car will require the longest time to come to a full stop. Here we may assume that all the cars decelerate at the same rate, so the car with the highest speed is the car that will take the longest income to a full stop.
The answer is car D, which velocity is 895 m/s.