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Soloha48 [4]
3 years ago
5

Energy Conservation:

Physics
1 answer:
Rina8888 [55]3 years ago
8 0

Answer:

3.9 m

Explanation:

Assuming no energy losses then all kinetic energy is converted to potential energy

0.5mv^{2}=mgh and making h the subject of the formula

h=\frac {v^{2}}{2g} where m is the mass of bike rider and bike, v is the velocity,  and g is acceleration due to gravity. Taking g as 9.81 m/s2, v as 8.5 m/s then

h=\frac {8.5^{2}}{2\times 9.81}=3.946992864\approx 3.9 m

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A computer disk drive is turned on starting from rest and has a constant angular acceleration. If it took 0.750 seconds for the
Irina-Kira [14]

Answer:

a) Θ = ω₀*t + ½αt² To complete first revolution 2π rads = 0*t + ½αt² and to complete the first and second combined 4π rads = 0*t + ½α(t+0.810s)² Divide second by first: 2 = (t + 0.810s)² / t² This is quadratic in t and has roots at t = -0.336 s ← ignore and t = 1.96 s ◄ b) Use either equation from above: 2π rads = 0*t + ½α(1.96s)² α = 3.27 rad/s² ◄ Hope this helps!

Explanation:

6 0
4 years ago
A mine car, whose mass is 440kg, rolls at a speed of 0.50m/s on ahorizontal track, as the drawing shows. A 150kg chunk of coalha
ella [17]

Answer: 0.56 m/s

Explanation:

hello, there is 25° inclination angle for the chute in the drawing. Thankfully, I know this problem. The conservation of momentum.

so there are X and Y components for the momentum in this problem. The Y component is not conserved as when the coal gets in the cart, the normal force exerted by the surface reduces it to 0.

Now, the X component is definitely conserved here.

so you have the momentum of the cart which is 440*0.5 added to the momentum of the chunk which is 150*0.8*cos(25°), that is the momentum before the coupling between the objects. Afterwards both objects will have the same velocity, so we write the equation like this:

440*0.5 + 150*0.8*cos(25) = 440*v_{final} + 150*v_{final} \\ => 220+120*cos(25) = (440+150)v_{final} => v_{final} = \frac{220+120*cos(25)}{590}  = 0.56 m/s

3 0
3 years ago
One method of determining the location of the center of gravity of a person is to weigh the person as he/she lies on a board of
andrey2020 [161]

Answer:

x = 1.018 m

Explanation:

given,

height of man = 190 cm

                       = 1.9 m

scale reading on left = 450 N

scale reading on the right = 390 N

Let center of gravity of man be x distance from feet, feet is on right side.

For system to be in equilibrium moment about center should be equal to zero.

∑M = 0

now,

450(1.9 - x ) - 390 × x = 0

450(1.9 - x ) = 390 × x

855 - 450 x = 390 x

840 x = 855

 x = \dfrac{855}{840}

 x = 1.018 m

hence, point of center of gravity from feet is equal to x = 1.018 m

7 0
4 years ago
Which type of rock contains minerals arranged in crystals and forms when molten rock cools and turns solid?
Katena32 [7]
The answer to ur question is: C
7 0
4 years ago
Can someone pls help me with this?
alexira [117]
C because they are both going in a constant speed
6 0
3 years ago
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