Answer:
The approximate terminal velocity of a sky diver before the parachute opens is 320 km/h.
Explanation:
- The terminal velocity is the maximum magnitude of velocity that is attained by the diver when he or she falls in the air.
- The terminal velocity of the person diving in air before opening parachute is 320 km/h that means the velocity when the person is experiencing free fall is 320 km/h.
- During terminal velocity, we can represent mathematical equation as;
Buoyancy force + drag force = Gravity
Answer:
See the explanation below.
Explanation:
A)
He was trying to say that everything that exists on this planet is a product of the explosion of stars billions of years ago and that the elements that were originated by the high temperatures of such an explosion are present on our planet, the human beings have chemical elements within our bodies such as carbon, oxygen, and hydrogen, these same elements are found in stars in the different galaxies.
B)
I agree with what was explained by Carl Sagan, the stars are born as a result of the death of other stars when the stars are small, its death consists only in an increase in volume followed by a collapse where it is reduced in size, but the stars of a considerable size such as Aldebaran, Antares, and others, their fate will be different they will explode, such explosion will generate great energy that will form the chemical elements and clouds of great density, depending on the gravitational interactions, a new star will be formed the heavier elements that revolve around the new star will be compacted generating new planets, thus generating a new solar system, which can last billions of years to form.
The solution for this problem is:
If they feel 50% of their weight that means that the
centripetal force is also 50% of their weight 1g - 0.5g = 0.5g
Then 0.5* 9.8m/s² * 18m = 88.2 would be v²
Then get the square root, the answer would be:
and v = 9.391 m/s is the answer.
Answer
given,
before collision
mass of car A = m_a = 1300 kg
velocity of car A = v_a = 35 mph
mass of car B = m_b= 1000 kg
velocity of car B = v_b = 25 mph
after collision
V_a = 30 mph
V_b = 31.5 mph
Initial momentum
final momentum
here initial momentum is equal to the final momentum of the car.
hence, momentum is conserved in the collision.
The correct options are:
<span>B. Radiation is heat flowing in waves.
C. Conduction is heat flowing between two objects that are touching each other.
In fact, radiation is heat transferred by electromagnetic waves, while conduction is the heat transfer between touching objects (the particles of one object collide with the particle of the other object, and so heat is transferred via the transfer of kinetic energy between the molecules).
Instead, option A is wrong (because conduction </span>is the heat transfer between touching objects) and option D is wrong because convection is the heat flowing when a liquid or a gas carries the heat.