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White raven [17]
3 years ago
10

A girl is riding her bike and coasting down a hill. When she gets to the bottom of the hill, her bike continues to move without

her pedaling. What type of energy is her bike using ?
a. potential
b. kinetic
c. solar
d. thermal

y’all, i have so many more questions
Physics
1 answer:
ddd [48]3 years ago
6 0

Answer:

Her bike is using kinetic energy

B

Explanation:

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a basketball player jumped straight up to grab a rebound. If she was in the air for .8 second how high did she jump
Alona [7]
Answer:
0.78m (rounded to nearest hundredth of a meter)

explanation:
time taken for going up=time taken for drop down after reaching the highest point. at the highest point, the velocity becomes 0.

now all thats left is dropping an object from a height (h) and seeing how long it takes to reach the ground. then find out the flight’s total time divided by 2 (0.8/2=0.4)

lets say the velocity is v and the height she jumped to is h. we can make a kinematic expression:
s=vt+½gt²

once we put it all together you should get this:

h=0×0.4+½(9.81) 0.4²


.
∴
Time taken for downward drop
=
0.8
2
=
0.4
s
Suppose that she jumped with initial velocity
=
u

Also suppose that she jumped to a height
h
Using following kinematic expression
s
=
u
t
+
1
2
g
t
2
and inserting various quantities we get
h
=
0
×
0.4
+
1
2
(
9.81
)
0.4
2

h
=
0.78
m
rounded to nearest hundredth of a meter.
5 0
3 years ago
Magnetic Field: is a region around the charged particle where the electric force is exerted on other charged particles.
nalin [4]
The answer for this question should be TRUE
8 0
2 years ago
Adrian 80.0kg jumps out of an airplane at an altitude of 1.00×10^3m. After his parechute deploys, the adrian lands with a veloci
Vera_Pavlovna [14]

-- Before Adrian left the airplane, his gravitational potential energy was

(mass) x (gravity) x (height) = (80kg) x (9.81m/s²) x (1,000m) = 784,800 joules


-- When he reached the ground, his kinetic energy was

(1/2) x (mass) x (speed)² = (40kg) x (5m/s)² = 1,000 joules


-- Between the airplane and the ground, the Adrian lost

(784,800 joules) - (1,000 joules) = 783,800 joules 

Where did all that energy go ?
Energy never just disappears.  If it's missing, it had to go somewhere.

The Adrian used  783,800 joules of energy to push air our of his way
so that he could continue his parachute jump, and reach the ground
in time to be home for dinner. 
4 0
3 years ago
Mechanical (sound) waves are unable to travel through a vacuum, such as through space, but radio waves are transmitted to earth
Hitman42 [59]
The answer is C radio waves are very high energy mechanical waves.
7 0
3 years ago
Can someone help me?​
Leviafan [203]

Car X traveled 3d distance in t time.  Car Y traveled 2d distance in t time. Therefore, the speed of car X, is 3d/t,  the speed of car Y, is 2d/t. Since speed is the distance taken in a given time.

In figure-2, they are at the same place, we are asked to find car Y's position when car X is at line-A. We can calculate the time car X needs to travel to there. Let's say that car X reaches line-A in t' time.

V_x .t' = 3d\\ \frac{3d}{t} .t' = 3d\\ t'=t

Okay, it takes t time for car X to reach line-A. Let's see how far does car Y goes.

V_y.t = \frac{2d}{t} .t = 2d

We found that car Y travels 2d distance. So, when car X reaches line-A, car Y is just a d distance behind car X.

4 0
3 years ago
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