Astone is thrown straight up from the ground with an initial speed of 15.2 m/s. at the same instant, a stone is dropped from a height of h meters above ground level. the two stones strike the ground simultaneously. find the height h. the acceleration of gravity is 9.8 m/s 2 . answer in units of m.

47 m

Explanation:

Time of flight of stone thrown up = time of fall of stone dropped down.

Time of flight = 2u /g

where u is initial velocity and g is acceleration due to gravity.

= 2 x 15.2 / 9.8

=3.10 s.

For fall of second stone

time of fall t = 3.1 s

Height h = ?

h = ut + .5 g t²

= 0 + .5 x 9.8 x 3.1 x 3.1

= 47 m

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

he made 11 calls in one day