Explanation:
According to Newton's second law of motion:
Force is directly proportional to
Change of momentum/time taken
Change of momentum= mv-mu
where m is mass, u is initial velocity and v is final velocity. so,
F∝mv-mu/t
F∝m(v-u)/t
F∝ma (a=v-u/t)
F=kma where k is a constant
In SI units the value of k will become one so the equation will be:
F=ma
Answer:
A)
0.395 m
B)
2.4 m/s
Explanation:
A)
= mass of the cart = 1.4 kg
= spring constant of the spring = 50 Nm⁻¹
= initial position of spring from equilibrium position = 0.21 m
= initial speed of the cart = 2.0 ms⁻¹
= amplitude of the oscillation = ?
Using conservation of energy
Final spring energy = initial kinetic energy + initial spring energy
B)
= mass of the cart = 1.4 kg
= spring constant of the spring = 50 Nm⁻¹
= amplitude of the oscillation = 0.395 m
= maximum speed at the equilibrium position
Using conservation of energy
Kinetic energy at equilibrium position = maximum spring potential energy at extreme stretch of the spring
Answer:
2.34 m
Explanation:
The cat saw the pot for 0.25 s each time. use the second equation of motion to find the velocity of the pot.
x= ut + 0.5 at²
x = 2.00 m
t = 0.25 s
a = - g = -9.8 m/s²
2.00 -0 = u (0.25) - 0.5 (9.8) (0.25)²
⇒u = 9.225 m/s
Use the third equation of motion:
2as = v²-u²
at highest point, final velocity is zero. v = 0. a =-g = -9.8 m/s²
s = -(9.225)²/(-9.8×2) =4.34 m
The height above the window top:
4.34 m - 2 m = 2.34 m
Answer:
It becomes wider
Explanation:
Because The bigger the object the wave interacts with, the more spread there is in the interference pattern. Decreasing the size of the opening increases the spread in the pattern.
