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Lubov Fominskaja [6]

2 years ago

4

The output of a mobile phone charger is labelled ‘5 V, 1 A, 5 W’. How much electrical energy will be supplied by the charger whe

n it runs steadily for ten minutes?

1 answer:

boyakko [2]2 years ago

7 0

Answer:

5W

Explanation:

Power = Voltage * current

Voltage = 5v

Current = 1A

Power = 5*1 = 5w

Since the charger is used for 10minutes, the power used is 5Wh.

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A stationary boat in the ocean is experiencing waves from a storm. The waves move at 59 km/h and have a wavelength of 145 m . Th

krek1111 [17]

Answer:

The time elapses until the boat is first at the trough of a wave is 4.46 seconds.

Explanation:

Speed of the wave, v = 59 km/h = 16.38 m/s

Wavelength of the wave, $\lambda=145\ m$

If f is the frequency of the wave. The frequency of a wave is given by :

$v=f\lambda\\\\f=\dfrac{v}{\lambda}\\\\f=\dfrac{16.38\ m/s}{145\ m}\\\\f=0.112\ Hz$

The time period of the wave is given by :

$T=\dfrac{1}{f}\\\\T=\dfrac{1}{0.112\ Hz}\\\\T=8.92\ s$

We need to find the time elapses until the boat is first at the trough of a wave. So, the time will be half of the time period of the wave.

$T=\dfrac{8.92}{2}\\\\T=4.46\ s$

Hence, this is the required solution.

5 0

2 years ago

A wildlife researcher is tracking a flock of geese. The geese fly 4.0 km due west, then turn toward the north by 40° and fly ano

Fudgin [204]

Answer:

(a). The distance is 7.06 km due to west.

(b). The magnitude of their displacement is 7.51 km.

Explanation:

Given that,

The geese fly 4.0 km due west, then turn toward the north by 40° and fly another 4.0 km.

According to figure,

(a). We need to calculate the distance

Using formula of distance

$AD=AB+BD$

Put the value into the formula

$D= 4+4.0\cos40^{\circ}$

$D=7.06\ km$

The distance is 7.06 km due to west.

(b). We need to calculate the magnitude of their displacement

Using formula of displacement

$AC=\sqrt{(CD)^2+(AD)^2}$

Put the value into the formula

$AC=\sqrt{(4.0\sin40)^2+(7.06)^2}$

$AC=7.51$

The magnitude of their displacement is 7.51 km.

Hence, (a). The distance is 7.06 km due to west.

(b). The magnitude of their displacement is 7.51 km.

7 0

2 years ago

Match each label to the boundary it describes. convergent boundary new crust forms transform boundary crust submerges into the m

Paraphin [41]

The answers would be:

CONVERGENT boundary - Crust submerges into the mantle

TRANSFORM boundary - neither forms nor submerges

DIVERGENT boundary - new crust forms

If you'd like to know more about the different boundaries, read on:

Convergent boundaries occur when two plates move TOWARDS each other. The event where crust submerges into the mantle is called <em><u>subduction</u></em> and this occurs when an oceanic plate and a continental plate collide. The oceanic plate is more dense and thinner than the continental plate, so it slides under it.

Transform boundaries occur when two plates slide against each other. They move slide side by side, so nothing is formed nor do they go under each other. Although, this type of boundaries create strong earthquakes.

Lastly, divergent boundaries occur when two plates move apart. The separation creates a way for magma to come up. New crust is formed when the magma that seeps out is cooled by its cooler surroundings. This is observed in the mid oceanic ridge.

7 0

2 years ago

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A cliff diver on an alien planet dives off of a 32 meter tall cliff and lands in a sea of hydrochloric acid 1.20 seconds later.

Cloud [144]

Answer:

44.4m/s^2

Explanation:

Use the formula...S = ut + 1/2at^2

where...S = 32m...u = 0m/s....t = 1.20s

32 = (0)(1.20) + 0.5(1.20^2)a

;Acceleration of free fall = 44.4m/s^2

3 0

2 years ago

An object moving at a constant velocity travels 274 m in 23 s. what is its velocity?

svetlana [45]

V= 274 meters / 23 sec

V= 11.91 meters per sec

6 0

2 years ago

Read 2 more answers