Answer:
v = 3.24 m/s
Explanation:
Since we don't have time, we can use the formula;
(Final distance - initial distance)/time = (initial velocity + final velocity)/2
Thus;
(x_f - x_i)/t = ½(v_xi + v_xf)
We are given;
x_i = 0 m
x_f = 5 m
v_xi = 0 m/s
v_xf = 5 m/s
Thus, plugging in the relevant values;
(5 - 0)/t = (0 + 5)/2
5/t = 5/2
t = 2 s
Using Newton's first law of motion, we can find the acceleration.
v = u + at
Applying to this question;
5 = 0 + a(2)
5 = 2a
a = 5/2
a = 2.5 m/s²
To get the speed, in m/s, of the block when it had traveled only 2.1 m from the top, we will use the formula;
v² = u² + 2as
v² = 0² + 2(2.5 × 2.1)
v² = 10.5
v = √10.5
v = 3.24 m/s
<u>Answer:</u>
The correct answer option is C. buzzer.
<u>Explanation:</u>
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.
Sound energy is produced when an object vibrates. The sound vibrations cause waves of pressure that travel through a medium, such as air, water, wood or metal. Sound energy is a form of mechanical energy.
Average speed= total distance divided by total time.
So our total distance here is 100miles.
And our total time is 50seconds
Average speed = 100/50
Average speed = 2 miles per second
Answer:
1. Proton number = 8
2. Electron number = 8
3. Neutron = 10
Explanation:
Mass number = 18
Proton = 8(isotope still retain their atomic number)
Electron = proton = 8( since it is a neutral atom)
Neutron number =?
Neutron = Mass number - proton
Neutron number = 18 - 8 = 10
