Answer:
a) , , b) , c) , d) , e)
Explanation:
a) The velocity function is determined by deriving the position function in time:
Velocities after 2 seconds and 4 seconds are, respectively:
b) The maximum height is reached when velocity is equal to zero:
The time when the projectile reaches the maximum height:
c) The maximum height is:
d) The projectile hits the ground when height is equal to zero:
The roots of the second order polynomial are presented below:
The first one is the only reasonable solution in physical terms.
e) The velocity of the projectile when it hits the ground is:
Answer:
Circular motion requires a"centripetal" force. Without a centripetal force, an object cannot travel in circular motion.
The circuit component the symbol represents is: C) Battery
Answer:
b) only the part of the low-density atmosphere that is between us and the surface of the star.
Explanation:
Since in the case of the stars, the photons that are received are not directly from the nucleus, but those that have traveled hundreds of thousands of years to reach the stellar atmosphere. Due to the stars are not at homogeneous temperature, density and pressure, but have gradients in different layers because of the nuclear reactions, superficial gravity or to their constant exchange of heat with their surroundings in an attempt to reach the thermodynamic equilibrium, the continuum observed in the stellar spectra comes from the inner layer of the photosphere.
Answer:
, (before collision), (after collision).
Explanation:
The total momentum is obtained using the Principle of Momentum Conservation:
It is trivial to find that final speed and total momentum of the system are zero:
The total kinetic energy of the system becomes zero due to the inellastic collision and the same masses and speeds. Total kinetic energies before and after collision are, respectively: