Answer:
D
Explanation:
an upright piano and a radio can use electrical energy
and a toaster uses it
Answer:
h = 22.35 m
Explanation:
given,
initial speed of the rock,u = 0 m/s
length of the window,l = 2.7 m
time taken to cross the window,t = 0.129 s
Speed of the rock when it crosses the window
v = 20.93 m/s
height of the building above the window
using equation of motion
v² = u² + 2 g h
20.93² = 0² + 2 x 9.8 x h
h = 22.35 m
Hence, the height of the building above the top of window is equal to h = 22.35 m
Answer:
So, the Distance covered by Ashley in 3 second is 19.5 meters.
Explanation:
Given:
Ashley takes 3 seconds to run from the batters box to first base at an average speed (velocity) or 6.5 meters per second.
So, Time = 3 s
Average Speed = 6.5 m/s
To Find:
Distance Ashley covers in time 3 s = ?
Solution:
Average Speed:
Average speed is defined as the rate of total distance covered in that time.
i.e
On substituting the given values we get
So, the Distance covered by Ashley in 3 second is 19.5 meters.
What are the jobs that you have to choose from
Answer:
299.88 kgm²/s
499.758 kgm²/s
Explanation:
R = Radius of merry-go-round = 1.63 m
I = Moment of inertia = 196 kgm²
= Initial angular velocity = 1.53 rad/s
m = Mass of person = 73 kg
v = Velocity = 4.2 m/s
Initial angular momentum is given by
The initial angular momentum of the merry-go-round is 299.88 kgm²/s
Angular momentum is given by
The angular momentum of the person 2 meters before she jumps on the merry-go-round is 499.758 kgm²/s