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3 years ago

Which is 20 miles per hour north an example of?

Physics

2 answers:

alina1380 [7]3 years ago

7 0

D. Velocity
This is because velocity is the speed of something in a specific way.

puteri [66]3 years ago

6 0

D. Velocity because it describes a speed and direction

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A merry-go-round with a a radius of R = 1.63 m and moment of inertia I = 196 kg-m2 is spinning with an initial angular speed of

Ulleksa [173]

Answer:

299.88 kgm²/s

499.758 kgm²/s

Explanation:

R = Radius of merry-go-round = 1.63 m

I = Moment of inertia = 196 kgm²

$\omega_i$ = Initial angular velocity = 1.53 rad/s

m = Mass of person = 73 kg

v = Velocity = 4.2 m/s

Initial angular momentum is given by

$L=I\omega_i\\\Rightarrow L=196\times 1.53\\\Rightarrow L=299.88\ kgm^2/s$

The initial angular momentum of the merry-go-round is 299.88 kgm²/s

Angular momentum is given by

$L=mvR\\\Rightarrow L=73\times 4.2\times 1.63\\\Rightarrow L=499.758\ kgm^2/s$

The angular momentum of the person 2 meters before she jumps on the merry-go-round is 499.758 kgm²/s

5 0

3 years ago

A charged isolated metal sphere of diameter 15 cm has a potential of 8500 V relative to V = 0 at infinity. Calculate the energy

Elan Coil [88]

Answer:

$u = 0.057 J/m^3$

Explanation:

Energy density near the surface of the sphere is given by the formula

$u = \frac{1}{2}\epsilon_0 E^2$

also for sphere surface we know that

$E = \frac{V}{R}$

R = radius of sphere

V = potential of the surface

now we have

$u = \frac{1}{2}\epsilon_0 (\frac{V^2}{R^2})$

now from the above formula we have

$u = \frac{1}{2}(8.85 \times 10^{-12})(\frac{8500^2}{0.075^2})$

$u = 0.057 J/m^3$

6 0

3 years ago

Bromine vapour is heavier than air. even so it's spreads upwards in the experiment above. Why?

Andrews [41]

Answer:

Bromine is heavier than air in terms of its atomic weight. Look at the periodic table bromine is lower than oxygen, nitrogen, etc. bromine in its gaseous phase will still float in air. This is due to the fact that gaseous bromine takes up a wide volume of space while having little mass.

8 0

2 years ago

A potter's wheel moves from rest to an angu-

dusya [7]

Answer:

angular acceleration =final angular speed + initial angular speed

time

=0.6283rad/s +0

24.6s

=0.6283/24.5

=0.025rad/s^2

Explanation:

first angular speed is equal to angular velocity and we will convert the unit to rad/s so 1rev/sec=6.283rad/s then angular acceleration is the rate at which the angular velocity changes with the time we have the final angular velocity,initial angular velocity and time now substitute the numbers in the formula and the value will be 0.025 rad per seconde square

8 0

2 years ago

Which statement best describes chemical properties of matter?

weqwewe [10]

Answer:

combustibility

Explanation:

generally observe as the identity of a substance change and one or more new substance form

5 0

2 years ago