here we know that the speed of the signal is same as the speed of light
so here we will have
the altitude of the airplane is given as
now we know that time taken by the signal to reach the control tower is given as
now it is given as
so above is the time taken by the signal to reach the control tower
The Voyager and Pioneer flybys of the 1970s and 1980s provided rough sketches of Saturn’s moons. But during its many years in Saturn orbit, Cassini discovered previously unknown moons, solved mysteries about known ones, studied their interactions with the rings and revealed how sharply different the moons are from one another.
Gravity on Earth pulls objects to the center of the Earth about 9.8 meters per second per second. The child's mass on the moon or at a space station is 40 kg. The child's weight at these places changes because gravity is different at these locations.
The Tropic of Capricorn is significant to understanding the Earth's geography because it marks the southern boundary of tropics.
Two possible situations:
- The car is at rest. In this case, there are only 2 forces acting on the car, both in the vertical direction: the weigth of the car (downward) and the normal reaction of the asphalt on the car (upward). The two forces are equal in magnitude but in opposite directions, so the net force is zero.
- The car is traveling at constant velocity. In this case, there are 4 forces: in the vertical direction, as before, we have the weigth of the car (downward) and the normal reaction of the asphalt on the car (upward). The two forces are equal in magnitude but in opposite directions, so the net force in the vertical direction is zero. However, this time the car is also moving, so there are forces acting along the horizontal direction: the driving force, which pushes the car forward, and the frictional force, which goes in the opposite direction. Since the car is moving at constant velocity, its acceleration is zero, so the net force must be zero: therefore, the magnitude of these two forces is equal.
