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Citrus2011 [14]
3 years ago
13

Can a runner on a track be accelerating even if she is running at a constant speed why or why not

Physics
1 answer:
Lynna [10]3 years ago
6 0
If the runner is running in a circular track then yes when something or someone is moving in a circular motion at a constant speed they are indeed accelerating. They’re accelerating because the direction of the velocity vector is changing
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A piece of glass has a temperature of 72.0 degrees Celsius. The specific heat capacity of the glass is 840 J/kg/deg C. A liquid
Nezavi [6.7K]

Answer:

741 J/kg°C

Explanation:

Given that

Initial temperature of glass, T(g) = 72° C

Specific heat capacity of glass, c(g) = 840 J/kg°C

Temperature of liquid, T(l)= 40° C

Final temperature, T(2) = 57° C

Specific heat capacity of the liquid, c(l) = ?

Using the relation

Heat gained by the liquid = Heat lost by the glass

m(l).C(l).ΔT(l) = m(g).C(g).ΔT(g)

Since their mass are the same, then

C(l)ΔT(l) = C(g)ΔT(g)

C(l) = C(g)ΔT(g) / ΔT(l)

C(l) = 840 * (72 - 57) / (57 - 40)

C(l) = 12600 / 17

C(l) = 741 J/kg°C

5 0
3 years ago
An object of mass m moving at a speed of v1 possesses kinetic energy that is equal to KE1. When the object's speed is doubled, t
Vera_Pavlovna [14]

Answer:

KE₂ = 4KE₁

Explanation:

KE₁ = ½mv₁²

KE₂ = ½mv₂²

KE₂ = ½m(2v₁)²

KE₂ = 4(½mv₁²)

KE₂ = 4KE₁

7 0
3 years ago
An ideal parallel-plate capacitor consists of a set of two parallel plates of area Separated by a very small distance 푑. This ca
dolphi86 [110]

Answer:

doubled the initial value

Explanation:

Let the area of plates be A and the separation between them is d.

Let V be the potential difference of the battery.

The energy stored in the capacitor is given by

U = Q^2/2C   ...(1)

Now the battery is disconnected, it means the charge is constant.

the separation between the plates is doubled.

The capacitance of the parallel plate capacitor is inversely proportional to the distance between the plates.

C' = C/2

the new energy stored

U' = Q^2 /  2C'

U' = Q^2/C = 2 U

The energy stored in the capacitor is doubled the initial amount.

8 0
3 years ago
You have your bicycle upside down for repairs, with is 66.0 cm diameter wheel spinning freely at 230 rpm. The wheel's mass is 1.
rosijanka [135]

Answer:

\omega_f = 17.86\ rad/s

Explanation:

given,

dia of wheel = 66 cm

radius = 33 cm = 0.33 m

mass of wheel = 1.90 Kg

speed of wheel = 230 rpm

time to hold the tire  = 3.10 s

Normal force = 2.7 N

coefficient of friction = 0.46

final angular speed = ?

we know

F = μ N

F = 0.46 x 2.7 = 1.242 N

torque

τ = F r

τ = 1.242 x 0.33 = 0.409 Nm

moment of inertia for wheel

I = MR²

I = 1.90 x 0.33²

I = 0.2069 kg m²

we now,

τ = I x α

\alpha = \dfrac{\tau}{I}

\alpha = \dfrac{0.409}{0.2069}

α = 1.981 rad/s²

we know,

\omega_f - \omega_i = \alpha\ t

\omega_f - (230\dfrac{2\pi}{60}) =- 1.981 \times 3.1

\omega_f - 24 = - 6.14

\omega_f = 17.86\ rad/s

7 0
2 years ago
I don’t understand the 4th one please help someone.
Gnoma [55]

Answer:

From point A to point D is 20

The final displacement is 32

Explanation:

AB=8

BC=8

CD=4

DE=8

EF=4

DE= 8 because the object moves 4 meters in each direction.

AB+BC+CD=20(A to D)

AB+BC+CD+DE+EF=32(Final displacement)

7 0
2 years ago
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