When Alana moving 19km/h, a stationary object will be perceived by her as moving toward her with 19km/h velocity. If the object is not stationary(velocity isn't zero), the speed will increase by the object velocity.
the relative speed of the tennis ball=
the speed of Alana + true speed of the tennis ball
19km/h+ 11km/h= 30km/h
Answer:
Explanation:Digestive juices secreted by various organs such as salivary glands in the mouth, stomach, liver and pancreas help in the process of digestion of food. Saliva secreted by the salivary glands in the mouth aids in the breakdown of starch present in the food to simple sugar
To solve this problem it is necessary to apply the concepts related to the magnetic field in a solenoid.
By definition we know that the magnetic field is,



At the same tome we know that the induced voltage is defined as


Replacing


PART A) Substituting with our values we have that

Therefore there is not induced electric field at the center of solenoid.
PART B) Replacing the radius for 0.5cm

Therefore the magnitude of the induced electric field at a point 0.5cm is 
Answer:
As mass increases, the time period increases.
Explanation:
Let a block of mass m is attached to a spring of spring constant K is set into oscillations.
The time period of the oscillation is defined as the time taken by the system t complete one oscillation.
The formula for the time period of spring mass system is given by

where, m is the mass of the block and K is the spring constant.
If the mass of the block increases, the time period of the system also increases.