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4 years ago

. After the action potential passes through an axon, what restores the resting potential?

1 answer:

7 0

D. Gated potassium channels open and allow sodium to flow out of the cell.
To restore the resting potential, the potassium ion flows out by the gated potassium channel.
Hope this helps.

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A wheel of radius R = 0.80 m is pulled by a rope looped around a frictionless axle. The total mass of the wheel and axle assembl

iragen [17]

Answer:

$\frac{K_T}{K_R}=\frac{600J}{188.63J}=3.18$

Explanation:

To find the rotational kinetic energy you first calculate the angular acceleration by using the following formula:

$\tau=I\alpha\\\\FR=I\alpha\\\\\alpha=\frac{FR}{I}$

F: force applied

R: radius of the wheel

I: moment of inertia

$\alpha=\frac{(120N)(0.80m)}{26.88kgm^2}=3.57\frac{rad}{s^2}$

With this value you calculate the angular velocity:

$\omega^2=\omega_o^2+2\alpha \theta\\$

you calculate how many radians the wheel run in 5.0m

$\theta=\frac{2\pi (0.8m)}{5.0m}=\approx1.00rad$

$\omega=\sqrt{2(3.57\frac{rad}{s^2})(1.00rad)}=2.67\frac{rad}{s}$

Next, you use the formula for the rotational kinetic energy:

$K_R=\frac{1}{2}I\omega^2=(26.88)(2.67)^2 J = 188.63J$

For the transnational kinetic energy you use the following equation:

$W=\Delta K_T$ (net work equals the change in the kinetic energy).

By replacing the you obtain:

$\Delta K_T=Fd=(120)(5.0)J=600J$

Finally, the ratio between translational rotational kinetic energy is:

$\frac{K_T}{K_R}=\frac{600J}{188.63J}=3.18$

hence, translational kinetic energy is three times the rotational kinetic energy.

6 0

3 years ago

State the relationship between the mass of trolley and acceleration of the trolley?

kogti [31]

Answer:  The complementary relationship indicated by the Newton's second law...

For a given applied force the acceleration of the trolley is inversely proportional to it's mass.

5 0

3 years ago

Explain why people have different skin colors?

stiks02 [169]

I think it because of UV rays ultra violet ray which can make their colors different

5 0

3 years ago

If the total momentum of a system of an old woman pushing a shopping cart is 450 kg×m/s, both with a velocity of 3 m/s, and the

Liono4ka [1.6K]

Answer:

100kg

Explanation:

Momentum is defined as the product of mass times velocity:

$p=mv$

The total momentum M must be equal to the sum of momentums of the system components, in this case the momentum of the lady plus the momentum of the cart:

$M=m_{woman}v_{woman}+m_{cart}v_{cart}$

since both the woman and the shopping cart have the same velocity:

$v_{woman}=v_{cart}=v$

the equation becomes:

$M=m_{woman}v+m_{cart}v\\M=v(m_{woman}+m_{cart})$

and since we need the mass of the cart we solve for $m{cart}$ :

$m_{woman}+m_{cart}=\frac{M}{v} \\\\m_{cart}=\frac{M}{v} -m_{woman}$

the values given by the problem are the following:

total momentum: $M=450kgm/s$

mass of the woman: $m_{woman}=50kg$

velocity: $v=3m/s$

we substitute all of them in the equation to find the mass of the shopping cart:

$m_{cart}=\frac{450kgm/s}{3m/s} -50kg\\\\m_{cart}=150kg-50kg\\\\m_{cart}=100kg$

the mass of the cart is 100kg.

7 0

3 years ago

if a chemical reaction uses up energy the reaction is? A. limiting B. a product C. endothermic D. exothermic.

Basile [38]

The reaction is endothermic if a chemical reaction uses up energy. There are two types of chemical reaction based on the energy usage which is the endothermic and the exothermic reaction. The endothermic reaction process is a chemical reaction that absorbs and uses the energy of its surrounding. The exothermic reaction is a chemical reaction process which releases the energy to its surrounding.

4 0

3 years ago