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Jobisdone [24]
3 years ago
13

A ball is thrown so that its speed increases by 20 m/s in 10 seconds. What is the ball’s acceleration?

Physics
1 answer:
sp2606 [1]3 years ago
7 0

Answer: a= 2 m/s²

Explanation: acceleration = change of speed/ time = 20 m/s / 10 s

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A fisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surfac
Paladinen [302]

Answer:

1.  λ = 5.60 m , 2.  T = 5.80 s  3.  v = 0.966 m/s   4.  A = 0.315 m

Explanation:

1. The definition of wavelength is the distance between two consecutive maximums or minimums, so that the wave is repeated, in this case they give us the distance between two consecutive maximums, therefore

    λ = 5.60 m

2. the period is the time it takes for the wave to start repeating itself, going through the same point. They give time to go from the highest point to the lowest point, which is the time for half a wavelength, so the time for a wavelength is

     T = 2 t

     T = 2 2.90

     T = 5.80 s

3. For all waves the speed is the product of the wavelength by the frequency and the frequency is the inverse of the period

    v = λ f

    f = 1 / T

   v =  λ / T

   v = 5.60 / 5.80

   v = 0.966 m / s

4. The amplitude of the wave is the value of the zero displacement point to the maximum displacement point, give the value between the maximum and minimum displacement

     A = d / 2

     A = 0.63 / 2

     A = 0.315 m

8 0
3 years ago
A blow-dryer and a vacuum cleaner each operate with a voltage of 120 V. The current rating of the blow-dryer is 13 A, while that
Feliz [49]

Answer:

(a) 1560 W

(b) 576 W

(c) 1.01

Explanation:

Voltage, V = 120 V

Current in dryer, I = 13 A

current in vacuum cleaner, i' = 4.8 A

(a) Power consumed by dryer,

P = V I = 120 x 13 = 1560 W

(b) Power consumed by vacuum cleaner

P' = V I' = 120 x 4.8 = 576 W

(c) Energy consumed by dryer

E = P x t = 1560 x 15 x 60 = 1404000 J

Energy consumed by the vacuum cleaner

E' = P' x t' = 576 x 40 x 60 = 1382400 J

the ratio of energies is

E : E' = 1404000 : 1382400 = 1.01

3 0
3 years ago
Name an object with the same diameter or a distance equal to the diameter of a crater on Halley’s nucleus.
natka813 [3]

Answer:

Asteroids:

Explanation:

Asteroids are rocky, airless worlds that orbit our sun, but are too small to be called planets. Tens of thousands of these minor planets are gathered in the main asteroid belt, a vast doughnut-shaped ring between the orbits of Mars and Jupiter. Asteroids that pass close to Earth are called near-earth objects.

3 0
3 years ago
When you push an object, it pushes back with an equal and opposite force
Ksju [112]

Answer:

I would say false

Explanation:

Because friction slows it down which means when the object bounces back it will not have the same energy or force that was applied before.

5 0
3 years ago
Which of the following describes density only in terms of metric units?
Alborosie
A) Kilograms per cubic meter. Every other option either contains pounds or feet, which are both units of measurement from the standard system, not the metric system.
7 0
3 years ago
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