Answer:
D = 4 m
Explanation:
Speed of cart in air track v₁ = 0.5 m/s
Speed of cart moved when air is turned off v₂= 1 m/s
The distance travelled by the cart is d₁ = 1 m
Work done (W) = F x d
Work done is equal to the kinetic energy
F x d = 1/2mv²
velocity is directly proportional to distance
therefore,
v₁²/ v₂² = d₁ / d₂
d₂ = d₁v₂² / v₁²
= 1 m x (1 m /s)² / (0.5 m/s)²
= 4 m
Answer:
Explanation:
The law of gravitation has to be used in this question along with Newton's second law
Answer:
d, the awnser all of the above
Answer:
Magnetic force, from north to south.
Explanation:
It is given that,
Mass of the ball, m = 140 g = 0.14 kg
Number of electrons,
Height, h = 110 m
Charge, q = ne
Magnetic field, B = 0.3 T
The potential energy at height of 110 meters is balanced by the kinetic energy as per the law of conservation of energy as :
Magnetic force is given by :
F = q v B
As the direction of magnetic field is from east to west, so from right hand thumb rule the direction of magnetic force is from north to south. Hence, this is the required solution.
Answer:
1.57772 m
Explanation:
M = Mass of actor = 84.5 kg
m = Mass of costar = 55 kg
v = Velocity of costar
V = Velocity of actor
= Intial height of actor = 4.3 m
g = Acceleration due to gravity = 9.81 m/s²
As the energy of the system is conserved
As the linear momentum is conserved
Applying conservation of energy again
The maximum height they reach is 1.57772 m