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3 years ago

5. Calculate the speed of Charlie who runs to the store 5 kilometers away in 40 minutes

1 answer:

7 0

This depends on what units you need to convert to, but the answer would be approximately 2.083 m/s.

5km/40min = 5000m/40min = 5000m/2400s = 2.083 m/s

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Guiana dolphins are one of the few mammals able to detect electric fields. In a test of sensitivity, a dolphin was exposed to th

iren [92.7K]

Answer:

0.05 V/m

Explanation:

V = Potential difference that is possible for the dolphin to detect = 0.5 mV

d = Distance between electrodes = 1 cm

Electric field strength is given by

$E=\dfrac{V}{d}$

$\Rightarrow E=\dfrac{0.5\times 10^{-3}}{1\times 10^{-2}}$

$\Rightarrow E=0.05\ V/m$

The corresponding electric field strength is 0.05 V/m

8 0

3 years ago

Question 2 of 10

Leya [2.2K]

Answer:

I would say B. It rids the body of something harmful.

Explanation:

Vomiting usually tries to get rid of something bad in your stomach. If you vomit when your sick its because its trying to get rid of that sickness.

Hope this helps >:3

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3 years ago

The heating element has a power of 2.5kW. The resistance of the heating is 17(ohms)

bezimeni [28]

Answer:

I = 12.12 A

Explanation:

P = 2.5 kw = 2500 w

formula

$P=I^{2} R$

$I=\sqrt{\frac{p}{R} } =\sqrt{\frac{1500}{17} } =\sqrt{147.06} =12.12 amp$

Hope this helps

8 0

2 years ago

The cue ball is deflected so that it makes an angle of 30.0° with its original direction of travel.

Alexus [3.1K]

Answer:

(a) θ= 43.89°

(b) $v_{1} = 1.88\sqrt{3} \frac{m}{s}$

$v_{2} = 6.79 \frac{m}{s}$

Explanation:

Ball 1:

$u_{1} = 7.52\frac{m}{s}$

Ball 2:

$u_{2} = 0\frac{m}{s}$

As the collision is elastic, it means that kinetic energy and momentum are conserved. Following that, we apply the law of conservation of energy and momentum:

$\frac{1}{2} m_{1}u_{1}^{2} = \frac{1}{2} m_{1}v_{1}^{2} + \frac{1}{2} m_{2}v_{2}^{2}$

and

$m_{1}u_{1} = m_{1}v_{1} + m_{2}v_{2}$

Where u is the velocity before the collision, and v are the velocities after the collision. Both previous equations can be simplified as:

$u_{1}^{2} = v_{1}^{2} + v_{2}^{2}$

and

$u_{1} = v_{1} + v_{2}$

This because the two balls have the same mass. We know that the cue ball is deflected and makes an angle of 30°. From conservation in x-direction, we get::

$56.55 = v_{1} ^{2} + v_{2} ^{2}$