1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Rama09 [41]
2 years ago
8

Which runner has greater kinetic energy: a 45 kg runner moving at a speed of 7 m per second or a 93 kg runner moving at a

Physics
1 answer:
bagirrra123 [75]2 years ago
7 0

Kinetic Energy = (1/2) (mass) (speed)

First runner:  KE = (1/2) (45kg) (49 m/s)  =  1,102.5 Joules  

Second runner:  KE = (1/2) (93kg) (9 m/s)  =  418.5 Joules

The <em>first runner </em><em>has 163</em>% more kinetic energy than the second runner has.

You might be interested in
At one point in space the Electric potential is measured to be 119 V at a distance of 1 meters away it is measured to be 43 V. F
Anni [7]

Answer:

76 V/m

Explanation:

V_{i} = Electric potential at initial location = 119 V

V_{f} = Electric potential at final location = 43 V

d = distance between initial and final location = 1 m

E = magnitude of electric field

Magnitude of electric field is given as

E = \frac{- (V_{f} - V_{i})}{d}

E = \frac{- (43 - 119)}{1}

E = 76 V/m

8 0
3 years ago
Choose ALL that apply
Keith_Richards [23]
The answers a a,b, and d
6 0
2 years ago
A rock is thrown upward from level ground in such a way that the maximumheight of its flight is equal to its horizontal rangeR.
Snowcat [4.5K]
A) The vertical component of velocity v is taking the rock to a height

Vertical component = vsin\theta
The time taken to reach maximum height = \frac{vsin\theta}{g}
So total time of rocks flight = \frac{2vsin\theta}{g}
Range of rock is due to the horizontal component of velocity = vcos\theta
Range = \frac{2*v*sin\theta*v*cos\theta}{g} = \frac{2*v^2*sin\theta*cos\theta}{g}
Maximum height = \frac{g*t^2}{2} = \frac{v^2*sin^2\theta}{2*g}
Since range = maximum height
We have \frac{2*v^2sin\theta*cos\theta}{g} = \frac{v^2*sin^2\theta}{2*g}
tan\theta = 4
\theta = 75.96^0
So when angle of projection is \theta = 75.96^0 range is equal to maximum height reached.
b) We have range = \frac{2*v^2*sin\theta*cos\theta}{g} =\frac{2*v^2*sin2\theta}{g}
Maximum of range is reached when \theta = 45^0
Maximum range = \frac{2*v^2}{g}
c) For range to be equal to maximum height only condition is tan\theta = 4, it does not depend upon acceleration due to gravity and velocity. That angle is a constant.
5 0
3 years ago
How does natural selection produce change in a population of mice?
sergey [27]

Answer:

The population of the mice will decrease to the faster, stronger, and smarter mice because the weaker will die because of natural selection.

Explanation:

5 0
2 years ago
Which of the following describes resistance force?
Verdich [7]
Force applied by the machine to over come resistance
5 0
3 years ago
Read 2 more answers
Other questions:
  • A raven flies south for 100 seconds of 10m/s, then flies 0.50km north in 50 seconds. What is the total distance? What is the tot
    5·1 answer
  • Which axis is the horizontal axis in a graph?*
    11·2 answers
  • The water level in a vertical glass tube 1.00 m long can be adjusted to any position in the tube. A tuning fork vibrating at 653
    15·1 answer
  • Need physics help! (there’s a picture)
    11·1 answer
  • The space around a charge or a pole in which a force is experienced is called a:
    8·1 answer
  • Which of the following is a definition of acceleration? *
    8·1 answer
  • Angles t and v are complementary.angles T has a mesure of (2X+10). Angle v has a measure of 48 what is the value of x
    5·1 answer
  • The coefficient of kinetic friction for a 22 kg bobsled on a track is 0.10. What force is required to push it down a 5.0 degree
    10·1 answer
  • 20 POINTS <br>What is an endothermic reaction?​
    9·2 answers
  • Cold air masses tend to originate from: Question 3 options: tropical areas an area where it's wintertime an area where it's summ
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!