Answer:
Planet will crash on to the Sun if the tangential velocity becomes zero and Rocket should be fired from Earth's orbit is at 30 m/s and in opposite direction to the Earth orbits the Sun
Explanation:
The orbital velocity of the Earth about the sun is 30 km/s. If we shoot a rocket with 30 km/s with respect to Earth in the opposite direction. Then the two velocity vectors cancel. The resultant velocity would be zero with respect to the Sun. resulting velocity is called as tangential velocity.
Planet will crash on to the Sun if the tangential velocity becomes zero and Rocket should be fired from Earth's orbit is at 30 m/s and in opposite direction to the Earth orbits the Sun
Answer:
B. Carbon can exist in many forms, but the total amount of carbon stays the same.
Explanation:
The true statement from the given choices is that carbon can exist in many forms but the total amount of carbon stays the same.
The amount of carbon in nature is fairly balanced and constant.
- There are two main forms of carbon.
- Carbon can exists in organic forms
- It can also exists in inorganic forms.
- These types of carbon takes different attributes and interacts with a wide range of atoms.
Answer:
option D
Explanation:
given,
initial speed of motor, ω₁ = 90 rad/s
final speed of motor, ω₂ = 30 rad/s
angle, θ = 180 rad
angular acceleration,α = ?
using equation of rotational motion
ω₂² = ω₁ ² + 2 α θ
90² = 30² + 2 x α x 180
360 α = 7200
α = 20 rad/s²
the angular acceleration of the motor comes out to be 20 rad/s²
the correct answer is option D