Answer:
Step-by-step explanation:
a) The work done is equivalent to the change in potential energy of the block. The force due to gravity in the direction down the ramp does the work.
ΔPE = mg(Δh) = (1.25 kg)(9.8 m/s²)(1.81 m·sin(55.3°) ≈ 18.23 J
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b) The kinetic energy of the block can be used to estimate the speed:
KE = ΔPE = 1/2mv²
v = √(2KE/m) = √(2(18.23 J)/(1.25 kg)) ≈ 5.4 m/s
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c) Steven has added kinetic energy to the block. So, the final kinetic energy it has will be ...
initial KE + ΔPE = final KE
final KE = (1/2)mv² + 18.23 J = (1/2)(1.25 kg)(2.0 m/s)² + 18.23 J
= 2.5 J + 18.23 J = 20.73 J
So, the final velocity will be ...
v = √(2(20.73)/1.25) ≈ 5.76 m/s
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<em>Comment on the question</em>
For those of you seeking to copy the answer to "which forces do non-zero work?" we observe that there is no list of forces in this question to choose from. The best we can say is that the operative force is the component of gravity that is parallel to the ramp surface.
Answer:
1st is 2
2nd is 6
3rd is 14
Step-by-step explanation:
Answer:
149.5
Step-by-step explanation:
Answer:
a) 0.04
b) 0.08
Step-by-step explanation:
Part a)
Divide the price of a pack by the number of stickers in a pack to get the price of one sticker.
$2/50 = $0.04/1
One stickers costs $0.04.
Part b)
Calculate 80% more than the price of one sticker.
80% in decimal form is 0.8. 80% more than the price is calculated with the factor 1.8.
($0.04)(1.8) = $0.072
Round 0.072 up because is rounded down, the profit is less than 80%.
0.072 => 0.08
Each sticker would need to be sold for $0.08.
Answer:
All you have to do is write an expression, you don't need to answer it.
Step-by-step explanation:
1. n-9
2. 3+p
3. (7*a)+2
i hope you understand