Answer:
t = 2 s
Explanation:
As we know that when object comes back to its initial position then the displacement of the object will be zero
so here we can say by kinematics equation
here we know that
now from above equation we know
so from above equation we have
t = 2 s
Answer:
(a)
(b) The gravitational energy stored in the Great Pyramid of Cheops is times greater than the daily food intake of a person (in Joules).
Explanation:
(a) Gravitational potential energy (with respect to the earth) is the energy possessed by an object due to its position from the surface of the earth.
It is given as:
where m = mass of object
g = acceleration due to gravity
h = height above the ground
∴
(b) A person's daily food intake = 2500 food calories
1 food calorie = 1000 regular calories
∴ 2500 food calories = 2500 * 1000 regular calories = 2500000 regular calories
We are given that :
1 regular calorie = 4.184 J
∴ 2500000 regular calories = 2500000 * 4.184 J =
Comparing this with the answer in (a) above:
The gravitational energy stored in the Great Pyramid of Cheops is times greater than the daily food intake of a person (in Joules).
Answer:
0.47 m
Explanation:
= Number of vibrations = 37
= total time taken = 33 s
= time period of each vibration
frequency of vibration is given as
Hz
= distance traveled along the rope = 421 cm = 4.21 m
= time taken to travel the distance = 8 s
= speed of the wave
Speed of the wave is given as
= wavelength of the harmonic wave
wavelength of the harmonic wave is given as
Answer:
3g
Explanation:
The acceleration of gravity on the surface of a planet is given by
where
G is the gravitational constant
M is the mass of the planet
R is the radius of the planet
Calling M the mass of the Earth, R its radius, and g its acceleration due to gravity, we have
is the mass of planet Z-34
is the radius of Z-34
We can ignore the different spin rate since the gravitational acceleration does not depend on that
So, the value of g on planet Z-34 will be
so, the correct answer is 3g