A passenger on a boat moving at 1.70 m/s on a still lake walks up a flight of stairs at a speed of 0.60 m/s , as shown in the figure . The stairs areangled at 45o pointing in the direction of motion as shown.

Write the vector velocity of the
passenger relative to the water.
Express your answer using two significant figures. Express
your answer in terms of the
unit vectors i
and j.

Answers

Answer 1

Answer: If you wish, you could choose i to be in the same direction as the motion and j in perpendicular direction (upwards).
The two speeds could be expressed as vectors. The speed of the boat is merely $1.7i+0j$ . The speed of the climbing man, using the boat as reference, is more complicated. It is $(0.60)/(√(2))i+(0.60)/(√(2))j=0.30√(2)i+0.30√(2)j$ . Calculate the sums of the two and the speed itself.

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Removing the dimensional prefix and express in scientific notation ( include unit)7.4nm
6.78 x 10^8 MHz
5.36 x 10^6 kV
1500mA

Calculate the following numbers into scientific notation (include units)

7800nm + 95pm =
2500nm - 7pm =
(65x10^4m) x (4.5x10^-6s-1)=
(24x10^5m) / (2x10^-8s) =

convert the following to the prefix commonly used (use units)
55 000 000 Hz
4.8x10^4V
0.0068s
0.00000000234m

Answers

7.4nm = 7.4 x 10⁻⁹m
6.78 x 10^8 MHz = 6.78 x 10¹⁴ Hz
5.36 x 10^6 kV = 5.26 x 10⁹V
1500mA=1.5 A

7800nm + 95pm = 7800.095 x 10⁻⁹ m
2500nm - 7pm = 2499.993 x 10⁻⁹ m
(65x10^4m) x (4.5x10^-6s-1) = 2.925 m/s
(24x10^5m) / (2x10^-8s) = 1.2 x 10¹⁴ m/s (that's 400,000 'c' !)

55 000 000 Hz = 55 MHz
4.8x10^4V = 48 KV
0.0068s = 6.8 mS
0.00000000234m = 2.34 nm

7.4 x 10^9 m
6.78 x 10^11 Hz
5.36 x 10^9 V
1.5 x 10^3 mA

1nm = 10^9m
and 1pm=10^11m

55MHz
48kV
234pm

PLEASE MARK BEST

The solubility of most solids _______ as temperatures decreases.

Answers

Answer:

The solubility of most solids decrease as temperatures decreases.

Hope this helps :)

Have a great day !

5INGH

Explanation:

Research indicates that inattentional blindness often decreases when people work on tasks that require a great deal of attention. Please select the best answer from the choices provided T F

Answers

Answer:

False

Explanation:

Inattentionla blindness is a condition that happens when you overview or do not notice an object that is not supposed to be in a certain place and that is strange for its context because you are paying attention to something else, this means that if you do a task that needs a great deal of attention you will actually increase the inattentional blindness.

The correct answer is F

What force keeps a water spider on the surface of water

Answers

i think it's surface tension force

A fishing boat using sonar to locate fish is employing _____. diffraction
reflection
refraction
interference

Answers

Answer: reflection

Explanation:

SONAR - Sound Navigation and Ranging

It works on the principle of Echo i.e. the reflection of sound. Sound waves are sent out which get bounced off a nearby object. The reflected sound waves is detected and distance to the object is estimated. Sonar is used to detect, navigate or communicate objects underwater. Thus, a fishing boat uses sonar to locate the fish. It is employing reflection.

The answer is Reflection

A beam of white light goes from air into water at an incident angle of 84.0∘. At what angles are the red 660 nm and violet 410 nm parts of the light refracted? Red light in water has an index of refraction equal to 1.331 and that of violet light is 1.342.

Answers

The angle at which the light got refracted is known as the angle of refraction. The angle of refraction of red light is 48.3°. While the angle of refraction of Violet light is 47.8°.

What is snell law?

"The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant, for the light of a given color and for a given set of media,

According to Snell's law. The formula for Snell's law is

$\rm {n= (sini)/(sinr) }$