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monitta
3 years ago
7

A runner increases her speed from 8.9 m/s to 18.3 m/s in 8 seconds. What is the acceleration of the runner

Physics
1 answer:
IgorLugansk [536]3 years ago
3 0
1.25m/s'2 by the first eq of motion
see the steps below
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A temperature of 20°c is equivalent to approximately
Yanka [14]
C would be your answer
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What is the binding energy (in MeV per nucleon) for the ⁶₃Li nucleus?
Strike441 [17]

Answer:

Explanation:

⁶₃Li will have 3 protons and 3 neutrons .

mass of proton in amu = 1.00727 amu

mass of neutron in amu = 1.00866 amu

mass of lithium nucleus in amu = 6.01512 amu

mass defect = 3 (  1.00727  + 1.00866 ) - 6.01512 amu

= .03267 amu

Binding energy = mass defect in amu x 931 Mev

= 30.41 MeV

binding energy per nucleon

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4 0
3 years ago
How do you best describe hypothesis? A. a carefully researched answer
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3 0
3 years ago
You're investigating a subway accident in which a train derailed while rounding an unbanked curve of radius 150 m, and you're as
Ad libitum [116K]
Refer to the diagram shown below.

v =  35 km/h, the speed limit of the train
r = 150 m, the radius of the curve
ω =  angular velocity
m = the mass of the strap
θ° = 15, the angle the strap makes with the vertical
T = tension in the strap

Note that
v = 35 km/h = 35*0.2778 m/s = 9.7223 m/s

The tangential velocity is v = rω, therefore the angular vcelocity is
ω = (9.7223 m/s)/(150 m) = 0.0648 rad/s

The centripetal force tending to make the train derail causes the strap to make an angle of 15 with the vertical.

Let θ =  the maximum allowable angle at  35 km/h.
For horizontal equilibrium,
Tsin(θ) = mrω²
For vertical equilibrium,
Tcos(θ) = mg
Therefore
tan(θ) = (rω²)/g
          = [(150 m)*(0.0648 rad/s)]/(9.8 m/s²)
          = 0.0643
θ = tan⁻¹ 0.0643 = 3.7°

Because 15 > 3.7, we conclude that the train exceeded the 35 km/h speed limit when rounding the curve.

Answer: The train exceeded the 35 km/h speed limit.

8 0
3 years ago
A neutral atom of aluminum has 13 protons and ______ electrons. (Enter a whole number.)
AlladinOne [14]
The answer is 13 electrons :)
8 0
3 years ago
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