Answer:
0.2695/s
Explanation:
Using the formula for calculating impulse
Impulse = m(v-u) = Ft
M is the mass
v is the final velocity.
u is the initial velocity
F is the force
t is the time
Get the time;
t = m(v-u)/F
t = 0.0055(220)/40
t = 0.0275s
Get the speed of the rifle
v = u+gt.
v = 0+9.8(0.0275).
v = 0.2695m/s
Hence the speed of the rifle is 0.2695m/s
Explanation:
Northern, Southern, Eastern, and Western.
Answer:
They experience the same magnitude impulse
Explanation:
We have a ping-pong ball colliding with a stationary bowling ball. According to the law of conservation of momentum, we have that the total momentum before and after the collision must be conserved:
where
is the initial momentum of the ping-poll ball
is the initial momentum of the bowling ball (which is zero, since the ball is stationary)
is the final momentum of the ping-poll ball
is the final momentum of the bowling ball
We can re-arrange the equation as follows
or
which means
(1)
so the magnitude of the change in momentum of the ping-pong ball is equal to the magnitude of the change in momentum of the bowling ball.
However, we also know that the magnitude of the impulse on an object is equal to the change of momentum of the object:
(2)
Therefore, (1)+(2) tells us that the ping-pong ball and the bowling ball experiences the same magnitude impulse:
The force applied to small piston = 2.2 x 10³ N
<h3>Further explanation</h3>
Given
a radius of 5 cm and 15 cm
weight 20000 N
Required
Force applied
Solution
Pascal Law :
F₁/A₁=F₂/A₂
A₁ = π.5²
A₂ = π.15²
F₁/ π.5² cm² = 20000/π.15² cm²
F₁ = 2222.22 N⇒2.2 x 10³ N
Answer:
0.178 °C
Explanation:
Given:
The frictional force, F = 48 N
Number of rubs, n = 18
Distance covered per rub, d = 7.16 cm = 0.0716 m
Total distance covered in 18 rubs, D = 0.0716 × 18 = 1.288 m
mass of the tissues warmed, m = 0.1 kg
Now,
Work done, W = Force × Displacement
W = 48 × 1.288 = 61.8624 J
Now,
Work done is the change in heat
W = ΔQ = 61.8624 J
also,
ΔQ = mCΔT
where, C is the specific heat
for human tissue, C = 3470 J/kg°C
thus,
61.8624 J = 0.1 × 3470 × ΔT
or
ΔT = 0.178 °C
Hence, the change in temperature is 0.178 °C
