Answer:
0.75m/s^2
Explanation:
3.6-1.2=2.4 m/s (Change in velocity)
2.4/3.2=0.75 m/s/s or m/s^2
Answer:
3 volts
Explanation:
Number of turns in primary coil =
= 100
Number of turns in secondary coil =
= 200
Voltage across primary coil =
= 1.5 volts
Voltage across secondary coil =
= ?
In a transformer, the ratio of number of turns of primary to secondary coil is equal to the ratio of the respective voltages i.e.
![\frac{N_{p} }{N_{s} } =\frac{V_{p} }{V_{s} }\\](https://tex.z-dn.net/?f=%5Cfrac%7BN_%7Bp%7D%20%7D%7BN_%7Bs%7D%20%7D%20%3D%5Cfrac%7BV_%7Bp%7D%20%7D%7BV_%7Bs%7D%20%7D%5C%5C)
Using the given values, we get:
![\frac{100}{200}=\frac{1.5}{V_{s} }\\V_{s}=1.5 \times \frac{200}{100}\\V_{s}=3](https://tex.z-dn.net/?f=%5Cfrac%7B100%7D%7B200%7D%3D%5Cfrac%7B1.5%7D%7BV_%7Bs%7D%20%7D%5C%5CV_%7Bs%7D%3D1.5%20%5Ctimes%20%5Cfrac%7B200%7D%7B100%7D%5C%5CV_%7Bs%7D%3D3)
Thus, the voltage measure across secondary coil would be 3 volts
Answer:
Here are the names and symbols
H is Hydrogen
Au is Gold
Potassium is K
Mg is Magnesium
Zinc is Zn
Iron is Fe
Cl is Chlorine
Na is Natrium/Sodium
Copper is Cu
Ag is Silver
Answer:
The time taken is ![\Delta t = 1.5 \ s](https://tex.z-dn.net/?f=%5CDelta%20t%20%20%3D%201.5%20%5C%20s)
Explanation:
From the question we are told that
The mass of the ball is ![m = 1.25 \ kg](https://tex.z-dn.net/?f=m%20%3D%20%201.25%20%5C%20kg)
The time taken to make the first complete revolution is t= 3.60 s
The displacement of the first complete revolution is ![\theta = 1 rev = 2 \pi \ radian](https://tex.z-dn.net/?f=%5Ctheta%20%20%3D%20%201%20rev%20%20%3D%20%202%20%5Cpi%20%5C%20%20radian)
Generally the displacement for one complete revolution is mathematically represented as
![\theta = w_i t + \frac{1}{2} * \alpha * t^2](https://tex.z-dn.net/?f=%5Ctheta%20%3D%20%20w_i%20t%20%20%2B%20%20%5Cfrac%7B1%7D%7B2%7D%20%2A%20%20%5Calpha%20%20%2A%20t%5E2)
Now given that the stone started from rest ![w_i = 0 \ rad / s](https://tex.z-dn.net/?f=w_i%20%20%3D%200%20%5C%20rad%20%2F%20s)
![2 \pi =0 + 0.5* \alpha *(3.60)^2](https://tex.z-dn.net/?f=2%20%5Cpi%20%3D0%20%20%20%2B%20%200.5%2A%20%20%5Calpha%20%20%2A%283.60%29%5E2)
![\alpha = 0.9698 \ s](https://tex.z-dn.net/?f=%5Calpha%20%20%20%3D%20%200.9698%20%5C%20%20s)
Now the displacement for two complete revolution is
![\theta_2 = 2 * 2\pi](https://tex.z-dn.net/?f=%5Ctheta_2%20%20%3D%20%202%20%2A%20%202%5Cpi)
![\theta_2 = 4\pi](https://tex.z-dn.net/?f=%5Ctheta_2%20%20%3D%204%5Cpi)
Generally the displacement for two complete revolution is mathematically represented as
![4 \pi = 0 + 0.5 * 0.9698 * t^2](https://tex.z-dn.net/?f=4%20%5Cpi%20%3D%20%20%200%20%20%2B%20%200.5%20%2A%200.9698%20%2A%20t%5E2)
=> ![t^2 = 25.9187](https://tex.z-dn.net/?f=t%5E2%20%20%3D%20%2025.9187)
=> ![t= 5.1 \ s](https://tex.z-dn.net/?f=t%3D%20%205.1%20%5C%20s)
So
The time taken to complete the next oscillation is mathematically evaluated as
![\Delta t = t_2 - t](https://tex.z-dn.net/?f=%5CDelta%20t%20%20%3D%20%20t_2%20%20-%20t)
substituting values
![\Delta t = 5.1 - 3.60](https://tex.z-dn.net/?f=%5CDelta%20t%20%20%3D%205.1%20-%20%203.60)
![\Delta t = 1.5 \ s](https://tex.z-dn.net/?f=%5CDelta%20t%20%20%3D%201.5%20%5C%20s)
Answer:
5 miles per hour
Explanation:
if you divide 15 by 3 you get 5, therefore the student is going 5 miles per hour.