Answer:
9
Explanation:
You divide the joules by the coulombs to find the voltage of the battery so, 27/3= 9
Answer:
Fnet = 12 N
Explanation:
Force on a point charge due to another point charge = kq1q2 / d^2
Force on +32uC = due to + 20uC + due to -60uC
where uC = 1 x 10^-6 C and k = 9 x 10^9 N m^2 / C^2
Net Force =
Fnet = 12 N
Answer:
the output power of the hearing aid in two significant figures is 3.2 × 10⁻⁸ W
Explanation:
Output power of sound is given as;
P = I*A
where;
I is the sound intensity = 90dB = 1 × 10⁻³ W/m²
A is the area through which the transmits;
since the canal is circular in shape.
Given;
D as diameter = 6.4mm = 0.0064 m
Output power of the hearing aid = (1 × 10⁻³ W/m²)*(3.217 × 10⁻⁵ m²)
= 3.2 × 10⁻⁸ W
Therefore, the output power of the hearing aid in two significant figures is 3.2 × 10⁻⁸ W.
Answer:
s = 11.46 m
Explanation:
Since, the reaction time is 0.75 s. Hence, the brakes shall be applied after this time. So, the car will start to slow down after covering a distance at the constant speed during this time. This distance can be given as follows:
s = vt
where,
s = distance covered by car before slowing down = ?
v = speed of car = (55 km/h)(1 h/3600 s)(1000 m/1 km) = 15.28 m/s
t = reaction time = 0.75 s
Therefore,
s = (15.28 m/s)(0.75 s)
<u>s = 11.46 m</u>