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3 years ago

14

You want to create a device that sends signals to your dog to stop barking. which type of electromagnetic wave would be most use

ful to investigate?

1 answer:

kati45 [8]3 years ago

6 0

The answer is radio waves. Th other waves can't send signals to a dog. Its just not how they travel.

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A ball rolls onto the path of your car as you drive down a quiet neighborhood street. To avoid hitting the child that runs to re

Ilya [14]

Answer:

a) F = -1035.385 N

b) Backwards

c) s = 15.60 m

Explanation:

Given information

$u$ = Initial Speed of Car = 15.0 m/s

$v$ = Final Speed of Car = 9.00 m/s

$t_{b}$ = Breaking Time = 1.30 s

$m$ = Mass of Car = 1040 kg

Part (a)

To find the force exerted on the car we use the following formula

$F = ma$

Where

$F$ = Force = unknown

$m$ = Mass of Car = 1040 kg

$a$ = Acceleration of Car / Deceleration of Car = unknown

To find the force (F) we need to first find the deceleration rate (a)

To find the deceleration rate we use the following formula

$a = \frac{v - u}{t}$

Inputting the given values

$a = \frac{15 - 9}{1.30} \\ a = -4.615$

To find the force

$F = ma \\ F = (1040)(-4.615) \\ F = (1040)(-4.615) \\ F = -1035.385 N$

Part (b)

Since the value of F is negative this means the the force was opposite the direction of motion, hence the force was backwards.

Part (c)

To find the total distance the car moved while braking we use the following formula

$v^2 = u^2 + 2as$

Where

$s$ = distance traveled

Inputting the values given

$(9)^2 = (15)^2 + 2(-4.615)s$

$s = 15.60 m$

6 0

3 years ago

A ramp is needed to allow vehicles to climb a 2 foot wall. The angle of elevation in order for the vehicles to safely go up must

stepan [7]

Answer:

Yes the ramp can be safely used

Explanation:

Here, we have

Length of longest ramp = 5 ft

Height of wall = 2 ft

Therefore, the sine of the angle adjacent to the ramp which is equal to the angle of elevation is given by;

$Sin\theta = \frac{Opposite \, side \, to\, angle}{Hypothenus\, side \, of\, triangle}$

Where:

The opposite side to angle = 2 ft wall and

Hypotenuse side = Ramp = 5 ft

Therefore,

$Sin\theta = \frac{2}{5} = 0.4$ and θ = sin⁻¹0.4 = 23.55 °

The ramp can be safely used as the angle it is adjacent to is less than the specified 30°.

5 0

4 years ago

How can a typical person avoid wasting water at home?

hodyreva [135]

The most suitable option would be C take baths instead of showers.
When doing this, you are using just an amount of water and you avoid water to keep on running. The main idea should be to reduce water usage so you need to pay attention not only when you take a bath but also when you brush your teeth. leave the water running while doing anything is one of the ways in which water is highly wasted

8 0

3 years ago

Read 2 more answers

A body is moving with a uniform acceleration of 2 m/s2. What does it mean?<br><br>

olchik [2.2K]

Answer:

it means the velocity is changing.

the rate of change of velocity is acceleration

so it means the body is accelerated at 2m/s^2

4 0

3 years ago

Read 2 more answers

Which of the following best describes an isotope? Which of the following best describes an isotope? an atom with an unequal numb

deff fn [24]

Answer:

a structural variation in which different atoms of the same element have different numbers of neutrons

Explanation:

An isotope is an atom of an element having the same number of protons but different number of neutrons. Different isotopes are used for different purposes. Example: some are used in medicines , food irradiation, etc.

Carbon has three isotopes C 12, C 13, C 14. All three of them have 6 protons but have different numbers of neutrons.

C 12 is a common element and is abundant in nature

C 13 is less abundant than C 12

C 14 is used for dating fossils . It is radioactive

6 0

3 years ago