The cold air sinks as it is heavier
Answer:
1.26m/s; 4.96m/s
Explanation
Acceleration is defined as the change I'm velocity of an object with respect to time.
Mathematically,
Acceleration (a) = change in velocity (v-u)/time (t)
Where v is the final velocity
u is the initial velocity
From the equation, it can be deduced that;
v = u+at
If the runner had an initial vertical velocity of -0.7 m/s over a period of 0.2seconds, its final velocity;
v = (-0.7)+9.81(0.2) (a=g=9.81m/s²)
v = -0.7+1.962
v = 1.26m/s
If the runner had an initial horizontal velocity of 3 m/s over a period of 0.2seconds, its final velocity;
v = 3+9.81(0.2)
v = 3+1.962
v = 4.96m/s
Answer:
The resulting velocity of marble B after the collision is 0.96 m/s.
Explanation:
Mass of marble A ,
Initial velocity of the marble A,
Mass of marble B,
Initial velocity of the marble B,
final velocity of the marble A,
final velocity of the marble B,
Applying law of conservation of mass:
The resulting velocity of marble B after the collision is 0.96 m/s.
Answer:
10.78 s
Explanation:
The force on the charge is computed by using the equation:
F = ma
∴
At time t(sec; the partiCle velocity becomes
The velocity of the charge after the time t(sec) is expressed by using the formula:
Answer:
7 ms⁻¹
Explanation:
When the weight is 50% more, if the actual weight is W, the weight at the dip will be 1.5 Mg . At the bottom, the forces acting are
Weight Mg , vertically downwards
Centripetal force towards the center of the circle
and the normal force N = 1.5 Mg, that acts towards the center
N - Mg = Mv²÷ r
1.5 Mg - Mg = M v² ÷ r
0.5 g = v² ÷ 10
⇒ v = 7 ms⁻¹ Car's speed at the bottom of the dip.