Goodmorning I can’t seem to remember this can someone help me

Dennis_Churaev [7]

Answer:

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object

Explanation:

it's newton's second law

5 0

2 years ago

A wheel has a rotational inertia of 16 kgm2. Over an interval of 2.0 s its angular velocity increases from 7.0 rad/s to 9.0 rad/

german

Answer:

<h2>128.61 Watts</h2>

Explanation:

Average power done by the torque is expressed as the ratio of the workdone by the toque to time.

Power = Workdone by torque/time

Workdone by the torque = $\tau \theta$ = $I\alpha * \theta$

I is the rotational inertia = 16kgm²

$\theta = angular\ displacement$

$\theta = 2 rev = 12.56 rad$

$\alpha \ is \ the\ angular\ acceleration$

To get the angular acceleration, we will use the formula;

$\alpha = \frac{\omega_f^2- \omega_i^2}{2\theta}$

$\alpha = \frac{9.0^2- 7.0^2}{2(12.54)}\\\alpha = 1.28\ rad/s^{2}$

Workdone by the torque = 16 * 1.28 * 12.56

Workdone by the torque = 257.23 Joules

Average power done by the torque = Workdone by torque/time

= 257.23/2.0

= 128.61 Watts

8 0

3 years ago

A current is established in a gas discharge tube when a sufficiently high potential difference is applied across the two electro

pishuonlain [190]

Explanation:

It is given that the number of electrons passing through the cross-sectional area in 1 s is $3.4 \times 10^{18}$ . Also, we know that charge on an electron is $-1.60 \times 10^{-19} C$ , then negative charge crossing to the left per second is as follows.

I- = $3.4 \times 10^{18} electrons \times -1.6 x 10^{-19} C/electrons$

I- = 0.544 A

As it is given that the number of protons crossing per second is $1.4 \times 10^{18}$ , as the charge on the proton is $+1.60 \times 10^{-19} C$ , then positive charge crossing to the right per second is calculated as follows.

I+ = $1.4 \times 10^{18} electrons \times 1.6 \times 10^{-19} electrons/C$

I+ = 0.224 A

I = l I+ l + l I- l

So, I = 0.544 + 0.224

= 0.768 A

Thus, we can conclude that the current in given hydrogen discharge tube is 0.768 A.

8 0

3 years ago

A sinusoidal electromagnetic wave from a radio station passes perpendicularly through an open window that has area 0.320 m2. at

AlexFokin [52]

Remember, half of the energy in an EM wave is in the E field, the rest is in the B field. Thus, multiply E field energy by 2.
To calculate the energy of the wave you must then use the following equation: W = A*t*c*2*(1/2*E^2*Eo). Where, A = Area, t = time, c = speed of light (which is a constant), E = Electric field, E0 = vacuum permittivity (8.85*10^-12 Nm^2/C^2). Substituting W =(0.320)*(26)*(3*10^8)*(2)*((1/2)*(1.95*10^-2)^2*(8.854*10^-12)) = 8.40*10^-6 J

5 0

3 years ago

A car's bumper is designed to withstand a 6.84 km/h (1.9-m/s) collision with an immovable object without damage to the body of t

den301095 [7]

Answer:

F = 5.256 x $10^{3} N$