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4 years ago

Why does a skateboard coasting on a flat surface slow down and eventually comes to a stop

Physics

2 answers:

Maurinko [17]4 years ago

5 0

It depends on what skateboard. It will stop mainly because some skateboards need a hill or curvy platform to function.

AveGali [126]4 years ago

5 0

The skateboard will slow down because of kinetic and static friction. Kinetic friction will cause it to slow down while it’s moving. It will eventually slow down to a point that its velocity can’t overpower the static friction, and it will stop.

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A square coil, enclosing an area with sides 2.0 cm long, is wrapped with 2 500 turns of wire. A uniform magnetic field perpendic

Delvig [45]

Answer:

The induced voltage in the coil is 0.25 V.

Explanation:

It is given that,

Area of a square coil is 2 cm or 0.02 m

Number of turns in the wire is 2500

A uniform magnetic field perpendicular to its plane is turned on and increases to 0.25 T during an interval of 1.0 s.

We need to find the induced voltage in the coil. According to Faraday's law, the induced emf in the coil is given by the rate of change on magnetic flux. So,

$\epsilon=\dfrac{-d\phi}{dt}\\\\\epsilon=\dfrac{-d(NBA)}{dt}\\\\\epsilon=NA\dfrac{-dB}{dt}\\\\\epsilon=-2500\times (0.02)^2\times \dfrac{0.25}{1}\\\\\epsilon=-0.25\ V$

So, the induced voltage in the coil is 0.25 V.

3 0

3 years ago

4720 kj of energy are supplied to a material in order to raise its temperature by 65k. if the specific heat capacity of the mate

jeka57 [31]

The mass of material is 26.6 Kg

Given:

Q = 4720 KJ

Change in Temperature (AT) = 65 K

Specific heat capacity of material (c) = 2730 J K Kg*K

The relation between Q, AT, c and m are related by following formula: Q=m* c*∆T,

Plugging value in heat formula:

4720KJ = m* 2730 J/Kg*K * 65K

4720KJ = m * 177450J/kg

Converting 177450 J/kg to Kg/KJ

177450 J/kg*1KJ/1000J = 177.450KJ/kg

Dividing both side by 177.450KJ/kg

4720KJ/177.450KJ/Kg = m*177.450KJ/Kg÷ 177.450KJ/Kg

Hence, the mass of material = 26.6 Kg

Learn more about Mass here:

brainly.com/question/19385703

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6 0

2 years ago

Sobre un cuerpo de 700 g de masa que se apoya en una mesa horizontal se aplica una fuerza de 5N en la dirección del plano. Calcu

kicyunya [14]

Answer:

(a) Ff = 3.95N

(b) Ff = 5N

Explanation:

(a) To find the friction force you use the second Newton law:

$F=ma$

But you take into account the applied force and the opposite friction force:

$F_a-F_f=ma$

you do Ff the subject of the formula and replace the values of the parameters:

$F_f=F_a-ma=5N-(0.700kg)(1.5m/s^2)\\\\F_f=3.95N$

(b) In the case of a motion with constant velocity you have that there is no acceleration. Hence:

$F_a-F_f=0\\\\F_f=F_a\\\\F_f=5N$

6 0

4 years ago

A wave has a wavelength of 6 mm and a frequency of 9 hertz. What is its speed? what is the answer and units?

Lisa [10]

Answer:The speed is 54 mm/s, the units are mm/s.

Explanation:

1) Data:

a) λ = 6mm
b) f = 9 Hz = 9 s⁻¹
c) v = ?

2) Formula:

wave equation: v = f × λ

3) Solution:

v = 9 s⁻¹ × 6mm

v = 54 mm/s

The speed is 54 mm/s, the units are mm/s.

5 0

3 years ago

A 1.15-kg grinding wheel 22.0 cm in diameter is spinning counterclockwise at a rate of 20.0 revolutions per second. When the pow

malfutka [58]

Answer:

Angular acceleration = -1.57 Rad/s^2

Number of revolutions = 800 revolutions

Explanation:

Mass = 1.15kg

diameter of the grinding wheel = 22.0cm

angular speed = 20 rev/s

1 Rev/s = 6.283 rad/s

20 Rev/s = 20 * 6.283 = 125.664 rad/s

Angular acceleration = Angular speed/ time taken for for the wheel rotation

Angular accleration = 125.664/80

Angular acceleration = -1.57 rad/s^2 (since the wheel is rotating counterclockwise)

number of revs = 0.5∝t²

number of revs = 0.5 * (1.57/2π) * 80²

number of revs = 800 revolutions

6 0

3 years ago

Read 2 more answers