Answer: The observing friend will the swimmer moving at a speed of 0.25 m/s.
Explanation:
- Let <em>S</em> be the speed of the swimmer, given as 1.25 m/s
- Let
be the speed of the river's current given as 1.00 m/s.
- Note that this speed is the magnitude of the velocity which is a vector quantity.
- The direction of the swimmer is upstream.
Hence the resultant velocity is given as,
= S — S 0
= 1.25 — 1
= 0.25 m/s.
Therefore, the observing friend will see the swimmer moving at a speed of 0.25 m/s due to resistance produced by the current of the river.
Answer:
mass and distance
Explanation:
force is mass while motion can also be regard as distance or movement
Answer:
= 9.8°
Explanation:
Width of one slit (a₁ ) = 1 / 1000 mm=0.001 mm = 10⁻⁶ m.
width of one slit in case 2 (a₂ ) = 1/500 =2 x 10⁻⁶ m
angular position of fringe, Sinθ = n λ /a
n is order of fringe , λ is wave length of light and a is slit aperture
So Sinθ ∝ 1 / a
Sin θ₁ /Sin θ₂ = a₂/a₁ ;
Sin20°/sinθ₂ = 2 / 1
sinθ₂ = Sin 20° / 2 = .342/2 = .171
θ₂ = 9.8 °
Answer:
-0.18 N
Explanation:
The motion of the piece of rubber is a uniformly accelerated motion, so we can find its acceleration using the suvat equation:

where:
v = 10 m/s is the final speed
u = 20 m/s is the initial speed
a is the acceleration
s = 102 m is the distance covered
Solving for a,

The net force acting on the piece of rubber is the force of friction; according to Newton's second law of motion, the force is equal to the product of mass (m) and acceleration (a):

Here we have
m = 0.125 kg is the mass
Therefore, the force of friction is:

And the negative sign means the direction of the force is opposite to the direction of motion.
C. course conditions
If the grass is grown then the golf ball will not be able to able to cover good ground distance