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2 years ago

Which of the following types of electromagnetic radiation has the highest energy?

Physics

1 answer:

Varvara68 [4.7K]2 years ago

3 0

B. Gamma rays
Gamma rays have highest energy

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A 216-m-wide river flows due east at a uniform speed of 2.2 m/s. A boat with speed of 7.9 m/s relative to the water leaves the s

Mademuasel [1]

Answer:

The magnitude of the velocity of boat w.r.t ground is 6.2015 m/s

Solution:

As per the question;

Width of the river, w = 216 m

Uniform speed of boat due east, $u_{x} = 2.2\hat{i} m/s$

Angle in north west direction, $\theta = 34^{\circ}$

Velocity of the boat relative to water, $v_{bw} = 7.9m/s$

Now,

Velocity of the boat relative to the water is given by:

$v_{bw} = -7.9cos34^{\circ}\hat{i} + 7.9sin34^{\circ}\hat{j}$

$v_{bw} = - 6.55\hat{i} + 4.42\hat{j} m/s$

Also, velocity of water w.r.t ground is $v_{wg} = u_{x} = 2.2\hat{i} m/s$

Now,

Magnitude of the velocity of boat w.r.t ground is given by:

$v_{bg} = v_{bw} + v_{wg}$

$v_{bg} = - 6.55\hat{i} + 4.42\hat{j} + 2.2\hat{i}$

$v_{bg} = - 4.35\hat{i} + 4.42\hat{j} m/s$

$|v_{bg}| = \sqrt{(- 4.35)^{2} + (4.42)^{2}} = 6.2015\ m/s$

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3 years ago

the force of friction between a 1000 kg car and the road is 10000 N, what is the fastest acceleration the car can achieve?

nordsb [41]

Answer:

1000

Explanation:

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Convert 525 pounds to kilograms using dimensional analysis setup

kobusy [5.1K]

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20 points please give me correct answer ( brainliest will be reward)

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Cause: sewage dumped in rivers,disease spread, and industrial waste dumped into rivers

Effect: fish die off, destroyed habitats, oil spills on land that mixes with run off

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