Answer:
B) Diphosphorus pentoxide
Explanation:
Speed is represented by distance divided by time. Graphically, constant speed is represented by a horizontal line on a speed-time graph.
<u>Explanation</u>
- In a very literal sense speed is considered to be scalar quantity and denotes how fast or quick objects move. Therefore, speed is considered to be the velocity or swiftness of an object to cover a certain amount of distance.
- There three types of speed high speed, average speed, and zero speed. Any object which moves at very high speed or moves very fast and quickly and subsequently can cover the considerable distance is called high-speed object. On the other hand, the average speed of an object is defined as the total distance covered divided by the time taken to cover that distance. Again when the object doesn't cover any distance at a given time or any object which has got no movement in it is called zero speed object.
- Constant speed objects are those objects which move at a constant speed. Constant speed here refers to mean objects which move at the same speed without increasing or decreasing.If we try to represent constant speed on the diagram or through graph it can be done by drawing a horizontal line on the speed-time- graph. Here Mr. Robert drives his car at a constant speed means that he was driving his car without increasing or decreasing the speed or at the same speed.It has the same increase in distance in the given time. Time increases at the right and distance increase constantly with time.
Answer:
2.59 Kg, 3.25 Kg
Explanation:
Acceleration can be found using equation
where s is the release distance, a is acceleration and t is time
Making a the subject of the formula
Substituting 0.28 for s and time for 1 second
Acceleration formula for the Atwood machine is given by
where m1 and m2 are first and second masses respectively
Two situations are possible
When m1>m2
Assuming m1 is 3.7kg which is heavier than m2
Substituting a for 
and m1 as 2.9Kg and taking acceleration due to gravity as 
10.37m2=28.449-1.624
10.37m2=26.825
m2=2.59 Kg
<u>When m1<m2</u>
Then m1=2.9Kg hence
-9.25m2=-28.449-1.624=-30.073
9.25m2=30.073
m2=3.25 Kg
Answer:
An axis is an invisible line around which an object rotates, or spins. The points where an axis intersects with an object's surface are the object's North and South Poles.
Explanation:
The Earth's axis is represented by the red line. The white circle represents axial precission, the slow "wobble" of the axis.
Answer:
6.78 m/s
Explanation:
Let the distance between the two friends is x .
Radius, r = 120 m
v = 7 m/s
Angular velocity, ω = v / r = 7 / 120 rad/s
Use the law of cosines for the triangle OAB
x^2 = 120^2 + 240^2 - 2 x 120 x 240 x Cosθ ...... (1)
differentiate with respect to t on both the sides
2 x dx/dt = - 57600 x (-Sinθ) dθ/dt
. ........ (2)
Put x = 240 m in equation (1), we get
240^2 = 120^2 + 24062 - 57600 Cosθ
Cosθ = 1/4
So, by the use of right angled triangle, Sinθ = √15/4
Put all the values in equation (2), we get
m/s = 6.78 m/s
