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Bess [88]
3 years ago
6

A speedboat initially at rest accelerates at 4.0 m/s (squared) for 7.0 s. How far does the speedboat move in 7.0 s?

Physics
1 answer:
Ulleksa [173]3 years ago
4 0
I think is 3 becuase when he star at 4
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A raft of mass 199 kg carries two swimmers of mass 52 kg and 70 kg. The raft is initially floating at rest. The two swimmers sim
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To solve this problem we will apply the concept related to the conservation of the Momentum. We will then start considering that the amount of initial momentum must be equal to the amount of final momentum. Considering that all the objects at the initial moment have the same initial velocity (Zero, since they start from rest) the final moment will be equivalent to the multiplication of the mass of each object by the velocity of each object, so

Initial Momentum = Final Momentum

(m_B+m_1+m_2)v_i = m_1v_1+m_2v_2+m_Bv_B

Here,

m_B =  mass of Raft

m_1 = Mass of swimmers 1

m_2 = Mass of swimmers 2

v_i = Initial velocity (of the three objects)

v_B = Velocity of Raft

Replacing,

(199+52+70)*0 = (52)(4)+(70)(-4)+199v_B

Solving for v_B

vB = \frac{72}{199}

v_B = 0.3618m/s

Therefore the velocity the rarft start to move is 0.3618m/s

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3 years ago
What Is the mass of 7.50 mol of uranium
Andru [333]
Moles x Mol mass = mass. 
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Read 2 more answers
A mosquito of mass 0.15 mg is found to be flying at a speed of 50 cm/s with an uncertainty of 0.5 mm/s. (a) How precisely may it
amid [387]

Answer:

a) Δx = t 0.05 + 0.5

,  Δx = 0.5 cm, b)  Do not present any problem

Explanation:

The kinematic equation for constant speed is

          v = x / t

          x = v t

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          Δx = dx /dv Δv + dx /dt Δt

          Δx = t Δv + v Δt

Speed ​​is

         v = (50.00 ± 0.05) cm / s

     

The most common uncertainty for the time of Δt = 0.01 s

    We replace

           Δx = t 0.05 + 50 0.01

           Δx = t 0.05 + 0.5

We must know the time to have an explicit value, if we assume that the measure was t = 1s

           Δx = 0.5 cm

b)

Do not present any problem since its value is not very small, we must take as soon as the quantum effects and the velocity are not so high that we must take into account the relativistic effects

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3 years ago
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Hunter-Best [27]

Answer:

  • Metals are good conductors of electricity <u>because they have free electrons</u> which help in the transfer of charge from one point to another.

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