the correct choice is
D. It immediately stops accelerating, and continues moving at the velocity it had when burnout occurred.
as soon as the rocket runs out of fuel, its engine stops firing gases which is mainly responsible for the acceleration of the rocket. hence the rocket stops accelerating. also, since there is no gravity or air resistance , there is no net force on the rocket after it runs out of the fuel. hence
a = acceleration = 0
we know that , at no acceleration , object moves at constant velocity. hence the rocket keeps moving at the velocity it had when burnout occured.
Answer:Expression given below
Explanation:
Given mass of spring
Compression in the spring
Let the spring constant be K
Using Energy conservation
potential energy stored in spring =Kinetic energy of Block
now conserving momentum
where is the final velocity
Answer:
Series equivalent resistance:
Parallel equivalent resistance:
Explanation:
The equivalent resistance in series circuit is calculated as
The equivalent resistance in parallel circuit is calculated as
Which can be simplified to
The parallel circuit has the higher equivalent resistance as compared to series circuit.
Answer: It's D
Explanation: just took the test
Answer:
Momentum of the car = kg meter per second
Explanation:
Julie is playing with a car which has mass = 6.3 g = kg
Velocity of the car is 2.5 meter per second
Since formula to calculate the momentum of an object is,
p = mv
Where, p = momentum of the object
m = mass of the object
v = velocity of the object
By substituting these values in the formula,
p =
= Kg meter per second
Therefore, momentum of the car will be Kg meter per second.