Answer:
The acceleration towards the center will be 
Explanation:
Given the running track is an oval shape, and the diameter of each half-circle is 74 meters.
Also, the runner took 1 minute and 40 seconds to complete 400 m one round of the track.
We need to find the acceleration towards the center.
First, we will find the speed.
Where 
is the speed.
is the distance covered by the rider that is 400 meters.
is the time taken by the rider to complete the lap which is 1 minute and 40 seconds. 
seconds.
So,
And
Where 
is the acceleration towards the center.
is the radius which will be the half of the diameter 74 meters.
Hence, the radius will be 37 meters.
So, the centripetal acceleration of the rider will be
The height of stairs a 60 kg student would have to run in order to burn off 1 Calorie of food energy will be 7.1 meters.
<h3>What is potential energy?</h3>
The potential energy is due to the virtue of the position and the height. The unit for the potential energy is the joule.
Given data;
Mass of student,m = 60 kg
Energy,E = 4190 J
Height of stairs,h=?
The potential energy is mainly dependent upon the height of the object. The potential energy is found as;
Potential energy = mgh
E=mgh
h=E/mg
h= 4190 J / (60 kg× 9.81 m/s²)
h = 7.1 metre
Hence the height of the stairs will be 7.1 meters.
To learn more about the potential energy, refer to the link;
brainly.com/question/24284560
#SPJ1
Given:
An ideal gas expands at constant pressure:
P = 105 pascals
V1 = 1 m3
V2 = 4 m3
then, the gas is compressed to 1/3 of the pressure and volume 2.50 m3.
Work at constant pressure:
W = PΔV
W = 105 pascals * (4 m3 - 1 m3)
W = 315 Joules
Work at constant volume is zero.
Answer:
Hubble's Discovery
cosmic microwave background radiation
Mass is how much matter an object contains and it is measured in kilograms, so choice A is correct: 43 kg.
