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3 years ago

Héłp mê ................???.?

Physics

2 answers:

Damm [24]3 years ago

7 0

Mating can only occur in warm water...

Finger [1]3 years ago

4 0

Mating can only occur in warm water

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Consider a basketball player spinning a ball on the tip of a finger. If a player performs 1.99 J of work to set the ball spinnin

sladkih [1.3K]

Answer:

25.8 rad/s

Explanation:

C = circumference of the hollow sphere = 0.749 m

r = radius of the sphere

Circumference of the hollow sphere is given as

C = 2π r

0.749 = 2 (3.14) r

r = 0.12 m

m = mass of the basketball = 0.624 kg

Moment of inertia of basketball is given as

$I = \left ( \frac{2}{3} \right )mr^{2}$

$I = \left ( \frac{2}{3} \right )(0.624)(0.12)^{2}$

I = 5.99 x 10⁻³ kg-m²

w = angular speed

KE = Kinetic energy of the ball = 1.99 J

Kinetic energy of the ball is given as

KE = (0.5) I w²

1.99 = (0.5) (5.99 x 10⁻³) w²

w = 25.8 rad/s

5 0

3 years ago

Estamos solos en el universo

maxonik [38]

¡los alienígenas son reales!

4 0

3 years ago

Read 2 more answers

At which temperature do the lattice and conduction electron contributions to the specific heat of Copper become equal.

sp2606 [1]

Answer:

At 3.86K

Explanation:

The following data are obtained from a straight line graph of C/T plotted against T2, where C is the measured heat capacity and T is the temperature:

gradient = 0.0469 mJ mol−1 K−4 vertical intercept = 0.7 mJ mol−1 K−2

Since the graph of C/T against T2 is a straight line, the are related by the straight line equation: C /T =γ+AT². Multiplying by T, we get C =γT +AT³ The electronic contribution is linear in T, so it would be given by the first term: Ce =γT. The lattice (phonon) contribution is proportional to T³, so it would be the second term: Cph =AT³. When they become equal, we can solve these 2 equations for T. This gives: T = √γ A .

We can find γ and A from the graph. Returning to the straight line equation C /T =γ+AT². we can see that γ would be the vertical intercept, and A would be the gradient. These 2 values are given. Substituting, we f ind: T =

√0.7/ 0.0469 = 3.86K.

4 0

3 years ago

Why is it incorrect to say "We ran out of gas", when referring to your cars energy source?

Allushta [10]

Maybe it’s suppose to say fuel or something fossil fuel or something like that

3 0

3 years ago

Read 2 more answers

A body moves due north with velocity 40 m/s. A force is applied

marshall27 [118]

Answer:

the direction of rate of change of the momentum is against the motion of the body, that is, downward.

The applied force is also against the direction of motion of the body, downward.

Explanation:

The change in the momentum of a body, if the mass of the body is constant, is given by the following formula:

$\Delta p=\Delta (mv)\\\\\Delta p=m\Delta v$

p: momentum

m: mass

$\Delta v$ : change in the velocity

The sign of the change in the velocity determines the direction of rate of change. Then you have:

$\Delta v=v_2-v_1$

v2: final velocity = 35m/s

v1: initial velocity = 40m/s

$\Delta v =35m/s-40m/s=-5m/s$

Hence, the direction of rate of change of the momentum is against the motion of the body, that is, downward.

The applied force is also against the direction of motion of the body, downward.

4 0

3 years ago