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3 years ago

9

How do smaller summer ice flores affect polar bears physically?

1 answer:

rosijanka [135]3 years ago

8 0

Answer:

Bears lose necessary body fat because they must swim longer in open ocean water.

Explanation:

Polar bears, like their cousins, the grizzly bears, must build up a store of body fat that they can live off of during the winter months. This is especially true of mother bears who give birth to cubs during this time and need enough nourishment to feed the cubs.

(can i have brainliest please?)

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Por una espira de 0.5 m2 de área circula una corriente de 5 A. Calcula la densi- dad de flujo magnético B considerando que la es

Sloan [31]

Answer:

$\beta=B=8.05\mu T$

Explanation:

The density of the magnetic flux is given by the following formula:

$\beta=\frac{\Phi_B}{A}=\frac{ABcos\theta}{A}=Bcos\theta$

The normal vector A and the vector of the magnitude of the magnetic field are perpendicular, then, the angle is zero:

The magnitude of the magnetic field is calculated by using the formula for B at a distance of x to a point in the plane of the loop:

$B=\frac{\mu_oIR^2}{2(x^2+R^2)^{3/2}}$

For x = 0 you have:

$B=\frac{\mu_oIR^2}{2R^3}=\frac{\mu_oI}{2R}$

R is the radius of the circular loop and its values is:

$R=\sqrt{\frac{A}{\pi}}=\sqrt{\frac{0.5m^2}{\pi}}=0.39m$

Then, you replace in the equation for B with mu_o = 4\pi*10^-7 T/A:

$B=\frac{(4\pi*10^{-7}T/A)(5A)}{2(0.39m)}=8.05*10^{-6}T=8.05\mu T$

and the density of the magnetic flux is

$\beta=B=8.05\mu T$

4 0

4 years ago

Two electrodes connected to a 9.0 v battery are charged to ±45 nc. What is the capacitance of the electrode?

mart [117]

Answer:

$5\cdot 10^{-9} F$

Explanation:

The capacitance of the electrode is given by:

$C=\frac{Q}{V}$

where

C is the capacitance

Q is the charge on the electrode

V is the potential difference

In this problem, we have

$Q=45 nC=45\cdot 10^{-9} C$

V = 9.0 V

Substituting into the equation, we find

$C=\frac{45\cdot 10^{-9}C}{9.0 V}=5\cdot 10^{-9} F$ (5 nF)

6 0

3 years ago

Why is an increase in speed a curved line on a position vs. time graph but a straight diagonal line on a speed vs. time graph?

guapka [62]

What do you need help with

7 0

3 years ago

Technician A says that valve overlap is the number of crankshaft degrees that both valves are closed. Technician B says that val

Vadim26 [7]

Answer: Technician B

Explanation: A valve overlap occurs when both the exhaust valve and the inlet valve are open at the same time.

It is also seen as the number of degrees at which both the inlet and exhaust valves are open.

Valve overlap helps in boosting the efficiency of the engine by taking advantage of the expelled pressure from the exhaust.

It is expressed mathematically in degrees of shaft rotation.

So, Technician B is very correct.

3 0

4 years ago

Potential energy and kinetic energy are forms of what kind of energy? 1. chemical 2. nuclear 3. electromagnetic 4. heat 5. mecha

blsea [12.9K]

Heat and mechanical energy.

4 0

3 years ago