tje average acceleration of the car is
the average acceleration of the car is 1.4 m/s
Answer:
the velocity is zero, the acceleration is directed downward, and the force of gravity acting on the ball is directed downward
Explanation:
Is this exercise in kinematics
v = v₀ - g t
where g is the acceleration of the ball, which is created by the attraction of the ball to the Earth.
At the highest point
velocity must be zero.
The acceleration depends on the Earth therefore it is constant at this point and with a downward direction.
The force of the earth on the ball is towards the center of the Earth, that is, down
all other alternatives are wrong
Answer:
The emf is 0.574 volt.
Explanation:
Given that,
Magnetic field
Length = 75.0 m
Velocity = 255 m/s
We need to calculate the emf
Using formula of emf
Where, v = velocity
l = length
B = magnetic field
Put the value into the formula
Hence, The emf is 0.574 volt.
The red giant star would turn into a red dwarf.
Answer:
Explanation:
Conceptual analysis
We apply the kinematic formula for an object that moves vertically upwards:
Where:
: final speed in ft/s
: initial speed in ft/s
g: acceleration due to gravity in ft/s²
y: vertical position at any time in ft
Known data
For ,; where h is the maximum height
for y=h,
Problem development
We replace , in the formula (1),
[ Equation (1)
in maximum height(h): , Then we replace in formula (1):
Equation(2)
We replace (h) of Equation(2) in the Equation (1) :