When jumping, a flea accelerates at an astounding 1100 m/s2 , but over only the very short distance of 0.58 mm ?

If a flea jumps straight up, and if air resistance is neglected (a rather poor approximation in this situation), how high does the flea go?

Answer;

=0.065 m or 65 mm

Explanation;

v = √(2as)

= √(2 * 1100m/s² * 0.00058 m) = 1.276 m/s

Therefore;  initial velocity = 1.276 m/s

Then s = v² / 2g

g = 9.8 m/s²

            = (1.276m/s)² / 19.6 m/s²

            = 0.065 m  or 65 mm

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:

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.