3 years ago

D. When Alan's puck is moving at 21 m/s south, it collides

Physics

1 answer:

kirza4 [7]3 years ago

5 0

D is s s s s s ss s s s s

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a 28.7 KG sled is pulled forward with a 63 net force across the ground with MK equals 0.169 what is the acceleration of the sled

abruzzese [7]

Answer:

$0.54\ \text{m/s}^2$

Explanation:

F = Force on the sled = 63 N

m = Mass of sled = 28.7 kg

$\mu_k$ = Coefficient of kinetic friction = 0.169

g = Acceleration due to gravity = $9.81\ \text{m/s}^2$

The force balance of the system is given by

$F-\mu_k mg=ma\\\Rightarrow a=\dfrac{F-\mu_k mg}{m}\\\Rightarrow a=\dfrac{63-0.169\times 28.7\times 9.81}{28.7}\\\Rightarrow a=0.54\ \text{m/s}^2$

The acceleration of the sled is $0.54\ \text{m/s}^2$ .

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2 years ago

The moon continues to orbit Earth in an example of the law of conservation of

marusya05 [52]

A gravity and or D angular momentum

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3 years ago

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Freight trains can produce only relatively small acceleration and decelerations. (a) what is the final velocity (in m/s) of a fr

m_a_m_a [10]

(a) We will use the equation v = u + at
Initial velocity u = 5.00 m/s
Acceleration a = 0.0600 m/s²
time = 8 min = 8 x 60 = 480 s
Final velocity
= u + at
= 5.00 + 0.0600(480)
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The final velocity is 33.8 m/s

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3 years ago

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When thorium (90 protons) ejects a beta particle, the resulting nucleus has

Sav [38]

Answer:

none of the above

Explanation:

The actual answer is '91 protons'. In fact, the beta decay of the thorium-234 is the following:

${}_{90}Th \rightarrow {}_{-1}e+{}_{91}Pa$

where inside the nucleus of Thorium (90 protons), a neutron turns into an electron (the beta particle) + a proton. Therefore, the resulting nucleus (which is Protoactinium) has a total of 90+1 = 91 protons.

So, the correct answer would be '91 protons'.

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3 years ago

If a car travels 10 min 2 seconds, what is its speed?

abruzzese [7]

If you meant the car travels 10 meters or miles then the answer would be 5m/s because v=d/t (v=10/2)

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2 years ago

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