The answer to the question is b because acid is a substance that tastes sour, reacts with metal and turns litmus paper blue
Answer:
2.521 (A); 14.0924 (V)
Explanation:
more info in the attachment, the answers are marked with red colour.
The radius, r, of the child from the center of the wheel is
r = 1.3 m
The wheel makes one revolution in 4.2 s. Its angular velocity is
ω = (2π rad)/(4.2 s) = 1.496 rad/s
The linear speed of the child is the tangential velocity, given by
v = rω
= (1.3 m)*(1.496 rad/s)
= 1.945 m/s
Answer: 1.95 m/s (nearest hundredth)
Whats the question?
djdkkd
Answer:
Approximately
. (Assuming that the drag on this ball is negligible, and that
.)
Explanation:
Assume that the drag (air friction) on this ball is negligible. Motion of this ball during the descent:
- Horizontal: no acceleration, velocity is constant (at
is constant throughout the descent.) - Vertical: constant downward acceleration at
, starting at
.
The horizontal velocity of this ball is constant during the descent. The horizontal distance that the ball has travelled during the descent is also given:
. Combine these two quantities to find the duration of this descent:
.
In other words, the ball in this question start at a vertical velocity of
, accelerated downwards at
, and reached the ground after
.
Apply the SUVAT equation
to find the vertical displacement of this ball.
.
In other words, the ball is
below where it was before the descent (hence the negative sign in front of the number.) The height of this cliff would be
.