What simple machines are used to create the shovel?
2 answers:
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Answer:
liquid state of lead T = 547ºC
Explanation:
The temperature change of the lead bullet can be found by the calorimetry equation
Q = m ΔT
Where heat is the energy transferred to lead during the crash, we can find average work
W = F x
With the crash it is very short we can use the average speed of the projectile during the crash
= (
+ v₀) / 2 = (600 + 300) / 2
= 450 m / s
This speed of the projectile inside the wall is very inaccurate, but it is better than using any of the two speeds given (initial and final)
W = Δp vm
W = (m -m v₀) vm
W = m ( -v₀) vm
W = 30 10⁻³ (300-600) 450
W = 4050 J
As we have a shock let's use the momentum
I = F t = ΔP
F = Δp / t
Let's replace
W = (Dp / t) x
With the crash it is very short we can use the average speed of the projectile during the crash
= (
+ v₀) / 2 = (600 + 300) / 2
= 450 m / s
This speed of the projectile inside the wall is very inaccurate, but it is better than using any of the two speeds given (initial and final)
W = Δp vm
W = (m -m v₀) vm
W = m ( -v₀) vm
W = 30 10⁻³ (300-600) 450
W = 4050 J
They tell us that 50% of the heat is absorbed by lead
Q = 50% W
Q = 2025 J
Let's calculate the temperature , the specific heat of lead is
cv = 128 J/kg ºC
Q = m Δt
ΔT = Q / m
ΔT = 2025 / 3010⁻³ 128
= 547C
If we review the periodic table, the melting point of lead is 327.3ºC and the boiling point is 1726ºC, since it has a higher temperature than the lead must be in a liquid state
The masses of two bodies their distance apart and the gravitational contents G is in every day case i.e. close to the earth surface the gravitational field is considered to be constant.
The acceleration of the bike is equal to opposing the movement (to the right).
Why?
Since after the rider slams the brakes, the bike came to a stop, we know that the acceleration is opposite to the velocity/movement.
We can use the following equation to calculate the acceleration:
So, substituting, we have: (let's consider negative to the left and positive to the right)
The negative sign means that the acceleration's direction is opposite to the movement.
Hence, we have that the acceleration is equal to opposing the movement (to the right).
Have a nice day!
Answer:
Explanation:
Height of building
H = 6m
Horizontal speed of first balloon
U1x = 2m/s
Second ballot is thrown straight downward at a speed of
U2y = 2m/s
Time each gallon hits the ground
Balloon 1.
Using equation of free fall
H = Uoy•t + ½gt²
Uox = 0 since the body does not have vertical component of velocity
6 = ½ × 9.8t²
6 = 4.9t²
t² = 6 / 4.9
t² = 1.224
t = √1.224
t = 1.11 seconds
For second balloon
H = Uoy•t + ½gt²
6 = 2t + ½ × 9.8t²
6 = 2t + 4.9t²
4.9t² + 2t —6 = 0
Using formula method to solve the quadratic equation
Check attachment
From the solution we see that,
t = 0.9211 and t = -1.329
We will discard the negative value of time since time can't be negative here
So the second balloon get to the ground after t ≈ 0.92 seconds
Conclusion
The water ballon that was thrown straight down at 2.00 m/s hits the ground first by 1.11 s - 0.92s = 0.19 s.
