Explanation:
According to the question ,
- mass = 920kg
- time = 1s
- Initial velocity = 16m/s
- Final velocity = 9.5m/s
And we need to find out ,
As we know that Force is the rate of change of momentum ,
F = ∆p/t
F = mv - mu/t
F = m(v - u)/t
F = 920(9.5-16)/1 N
F = 920 * -6.5 N
Force = -5980N
The direction of the force will be opposite to the direction of velocity of the car .
- Distance travelled while breaking ?
Using the 3rd equation of motion , we have ,
2as = v² - u²
2 (v-u)/t *s =(v+u)(v-u)
2(t)(s) = v + u
2 * 1 * s = 16 + 9.5
s = 25.5/2 m
s = 12.75 m
Answer:
1.53 cm
Explanation:
The relationship between wavelength and frequency for a wave is:
where
v is the speed of the wave
f is the frequency
is the wavelength
In this problem, we have:
is the frequency of the ultrasound wave
is the speed of sound in sea water at room temperature
Re-arranging the previous equation and solving for , we find the wavelength of the ultrasound wave:
Answer: C
Explanation: The atomic number of an element is determined by the number of protons because the number of protons in the nucleus of an atom is equal to the number of atoms.
Answer:
0.14 J
Explanation:
The maximum velocity is the amplitude times the angular frequency.
vmax = Aω
ω = vmax / A
ω = (3.2 m/s) / (0.06 m)
ω = 53.3 rad/s
For a spring-mass system:
ω = √(k / m)
ω² = k / m
k = ω²m
k = (53.3 rad/s)² (0.050 kg)
k = 142 N/m
The elastic potential energy is:
EE = ½ kx²
EE = ½ (142 N/m) (0.044 m)²
EE = 0.14 J
Answer:
R = 0.24 kilo-ohm
Explanation:
Given that,
Voltage, V = 12 volt
Current, I = 50 mA = 0.05 A
We need to find the resistance of the resistor. We can find it using Ohm's law. So,
V = IR
or
R = 0.24 kohm
So, the value of resistance is 0.24 kilo-ohm.