Answer:
2 min 40 s.
Explanation:
Distance = 800 ft
Speed (walking speed) = 300 ft/min
Speed = distance/time
Time, t = 800/300
= 8/3
= 2 min 40 s.
Answer:
Momentum of mass 
is 83·7 kg m/s towards north
Momentum of mass 
is 38·72 kg m/s towards east
Explanation:
Given
Mass of = 6·2 kg
Mass of = 4·4 kg
Velocity of mass = 
= 13·5 m/s
Velocity of mass = 
= 8·8 m/s
Momentum of mass = × = 6·2 × 13·5 = 83·7 kg m/s
Momentum of mass = × = 4·4 × 8·8 = 38·72 kg m/s
As mass is moving North, the direction of momentum will also be in that direction because the direction of momentum will be in the direction of velocity
As mass is moving East, the direction of momentum will also be in that direction because the direction of momentum will be in the direction of velocity
∴ Momentum of mass is 83·7 kg m/s towards north
∴ Momentum of mass is 38·72 kg m/s towards east
Answer:
Explanation:
Time period, T = 50 μs = 50 x 10^-6 s
Frequency is defined as the number of oscillations or vibrations completed in one second.
The reciprocal of time period is called frequency.
f = 1 / T
f = 1 / (50 x 10^-6)
f = 20,000 Hz
Angular frequency, ω = 2 x π x f
ω = 2 x 3.14 x 20,000
ω = 125600 rad/s
A. The number of protons is the same as the number as electrons, when its just a neutral atom
Answer:
T = 80√3 N ≈ 139 N
W = 160 N
Explanation:
Sum of forces on B in the x direction:
∑F = ma
80 N sin 60° − T sin 30° = 0
T = 80 N sin 60° / sin 30°
T = 80√3 N
T ≈ 139 N
Sum of forces on B in the y direction:
∑F = ma
80 N cos 60° + T cos 30° − W = 0
W = 80 N cos 60° + T cos 30°
W = 40 N + 120 N
W = 160 N
