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LiRa [457]
4 years ago
13

A bicycle takes 8.0 seconds to accelerate at a constant rate from rest to a speed of 4.0 m/s. If the mass of the bicycle and rid

er together is 85 kg, what is the net force acting on the bicycle? (Hint: Calculate Acceleration!)
Physics
1 answer:
Gnom [1K]4 years ago
4 0

Answer:

42.5 N

Explanation:

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The drift velocity should be in the same direction as the applied force. <br> a. true <br> b. false
Marina CMI [18]

It is a false statement i.e. drift velocity is not same in the direction as the applied force.

Drift velocity of a  current-carrying conductor can be explained as, the charges i.e. electrons do not  flow in the same direction of current. In other word, in most cases the movement of the electrons is almost random, with a small net velocity. So that , the drift velocity, in the direction opposite to the electric field.

Drift velocity v_{d} is inversely proportional to the number of electron per unit volume of the conductor e. Therefore, the formulation can be given as ,

v_{d} = σ E/ne

The above equation shows the drift velocity in a current carrying conductor  

where, v_{d} is drift velocity , σ is the conductivity, E is electric force and n is number of electrons per unit volume of the conductor e.

Hence here we can say that, the drift velocity is not in the same direction as the applied force.

To know more about drift velocity

brainly.com/question/17167604

#SPJ4

4 0
2 years ago
Practice
marshall27 [118]

Answer:

In both cases the height is greater than 10.3 m

Explanation:

Pressure is defined by the relationship

       P = F / A

in this case the force is the weight of the two gases

       F = W = m g

If we use the definition of density

      ρ = m / V

      V = A h

      m = ρ A h

we substitute

       P = ρ g h

       h = \frac{P}{\rho g}

For this case the density of the gases is

       ρ' = 0.9 \rho_{water}

       h =\frac{P}{0.9 \ \rho_{water} g}

we calculate

     ρ’= 0.9 \rho_{water}

     h = 1 105 / (0.9 1000 9.8)

     h = 11.3 m

      ρ’= 0.8 \rho_{water}

       h = 1 105 / (0.8 1000 9.8

       h = 12.8 m

In both cases the height is greater than 10.3 m

4 0
3 years ago
I need help ASAP please and thank u very much if u can answer i’m giving a brainliest to btw
NemiM [27]

Answer:

A I Think

Explanation:

8 0
3 years ago
On the moon what would be the force of gravity acting on an object that has a mass of 7 kg?
Rudiy27

Answer:

0

Explanation:

4 0
4 years ago
A flat loop of wire consisting of a single turn of cross-sectional area 7.80 cm2 is perpendicular to a magnetic field that incre
mihalych1998 [28]

Answer:

Explanation:

Area of crossection, A = 7.80 cm²

Initial magnetic field, B = 0.5 T

Final magnetic field, B' = 3.3 T

Time, t = 1 s

resistance of the coil, R = 1.2 ohm

The induced emf is given by

e=\frac{d\phi}{dt}=A\frac{B' - B}{t}

where, Ф is the rate of change of magnetic flux.

e = 7.80 x 10^-4 x (3.3 - 0.5) / 1

e = 2.184 mV

i = e/R

i = 2.184/1.2

i = 1.82 mA

4 0
3 years ago
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