Answer:
DO rinse your eye with saline solution or clean water. ...
DO blink. ...
DO pull your upper eyelid over your lower eyelid. ...
DO wear sunglasses. ...
DON'T rub your eye. ...
DON'T touch your eye with anything. ...
DON'T wear your contact lenses. ...
DON'T use redness-relieving eye drops.
Answer:
An athlete runs before jumping to gain momentum. Because it helps in jumping higher and longer because of inertia of motion gained due to the motion. When the athletes Jump they already have a forward motion that would be greater than that of a jump made from standing in one spot.
Explanation:
Answer:
10.77kgm/s
Explanation:
Impulse is defined as change in momentum of a body.
From Newton's second law
F = ma
F = m(v-u)/t
Ft = m(v-u) = Impulse
where;
M is the mass of the object
v is the final velocity of the object
u is the initial velocity of the object.
Using the formula to time the impulse
Impulse = m(v-u)
m = 0.745kg
Since the ball dropped from rest at a height of 3.75m, it's initial velocity can be calculated according to the equation of motion
g is positive (since it dropped from a height I.e downward motion)
v²= u²+2gH
v² = 0²+2(9.8)(3.75)
v² = 73.5
v = √73.5
v = 8.57m/s(initial velocity of the ball)
If the ball rebounds to a height if 1.78m, g will be negative (since it is an upward motion)
In this case
v² = u²-2gH
0² = u²-2(9.8)(1.78)
-u² = -34.89
u = √34.89
u = 5.91m/s (final velocity of the ball)
Impulse = 0.745(5.91-(-8.57))
Impulse = 0.745(5.91+8.57)
Impulse = 0.745(14.48)
Impulse = 10.77kgm/s
Note that the initial velocity was negated while calculating impulse due to rebounce.
1) V = a × t, where v is the velocity, a is the acceleration and t is the time
2) Vf - Vi = a × t
So 1.3 - 1.1 = a × 20
a = 0.01 m/s²
3) Vf - Vi = a × t
0 - 2 = a × 3
a = -2/3 m/s²
4) If an object is slowing down, the acceleration is negative and vice versa.
Answer:
500km
Explanation:
Given parameters:
Speed = 200km/hr
Time taken = 2.5hrs
Unknown:
Distance = ?
Solution:
To solve this problem, we use the speed, time and distance equation.
Therefore;
Distance = Speed x time
So;
Distance = 200 x 2.5 = 500km