Studies have shown that driving after drug use was more common among drivers who were

Jeff’s father is installing a do-it-yourself security system at his house. He needs to get a device from his workshop that conve

LekaFEV [45]

Answer:

The correct answer option is C. buzzer.

Explanation:

We know that Jeff's father needs to get a device from his workshop that converts electrical energy to sound energy.

So from the given options, buzzer is the best option Jeff's father can install in his house's security system.

An electric buzzer converts an electrical oscillating voltage into a sound output. In other words, the electrical pulses are converted into sound vibrations.

8 0

3 years ago

1. A car travels 45 kilometers/hour and accelerates to a speed of 65

olga_2 [115]

It’s pretty easy you just use the formul then replace the numbers to the words

6 0

3 years ago

Robin fired a bullet of mass 100 gm from a gun of mass 5 kg. The bullet leaves the gun with a speed of 400 m/s. After penetratin

Marina CMI [18]

(a) the recoil or backward velocity of the gun is 8 m/s.

(b) the bullet cannot completely penetrate the plank.

The given parameters include;

mass of the bullet, m₁ = 100 g = 0.1 kg

mass of the gun, m₂ = 5 kg

initial velocity of the bullet, u₁ = 400 m/s

thickness of the plank, x = 10 cm

To calculate the following:

(a) the backward velocity of the gun

let the backward velocity of the gun = u₂

Apply the principle of conservation of linear momentum.

m₁u₁ + m₂u₂ = 0

m₂u₂ = -m₁u₁

$u_2 = -\frac{m_1u_1}{m_2} \\\\u_2 = - \frac{0.1 \times 400}{5} \\\\u_2 = -8 \ m/s$

Thus, the recoil or backward velocity of the gun is 8 m/s.

(b) Can the bullet penetrate the plank of the wood completely ?

the bullet traveled 4 cm and lost ¹/₃ of u₁

the remaining distance to completely penetrate the plank = 6 cm

the final velocity of the bullet at 4 cm, v = 400 - ¹/₃ x 400 m/s = 266.67 m/s

the acceleration of the bullet is calculated as;

v² = u₁² + 2as

2as = v² - u²

$a = \frac{v^2 -u_1^2}{2s} \\\\a = \frac{(266.67)^2 -(400)^2}{2\times 0.04} = -1.111 \times 10^6 \ m/s^2$

Finally, determine the distance traveled by the bullet when it comes to a complete stop, that is the final velocity = 0

$v_f^2 = v^2 + 2ad\\\\2ad = v_f^2 - v^2\\\\d = \frac{v_f^2 - v^2}{2a} \\\\d = \frac{(0) - (266.67)^2}{2(-1.111\times 10^6)} \\\\d = 0.032 \ m$

d = 3.2 cm

The total distance traveled by the bullet inside the plank = 4 cm + 3.2 cm = 7.2 cm

Therefore, the bullet cannot completely penetrate the plank.

To learn more about linear momentum visit: brainly.com/question/15869303

6 0

3 years ago

To understand the nature of a sound wave, including its properties: frequency, wavelength, loudness, pitch, and timbre. Sound is

ozzi

Based on the information presented in the introduction of this given problem, sound wave is a propagation of pressure fluctuations in a medium.

Answer: Option C

Explanation:

A sound wave, accordingly, comprises of substituting compressions and rarefactions, or areas of high and low pressure, moving at a specific speed. Put another way, it comprises of an occasional (that is, wavering or vibrating) variety of pressure happening around the balance pressure winning at a specific time and spot.

Balance pressure and the sinusoidal varieties brought about by the section of an unadulterated sound wave. Sound wave requires a medium in order to propagate while the light wave doesn't need the medium to propagate.

3 0

3 years ago

Imajine que uma pessoa ande com velocidade de 150 passos por minuto e que o tamanho medio de seu passo seja de 1 metro quanto te

Ivanshal [37]

128.00 minutos andar

4 0

4 years ago