M = 1250 kg
V = 14.0 m/s
t = 7.25 s
F = ?
Impulse equation
F . t = m . V
:. F = mv/t
F = (1250 kg x 14.0 m/s) / 7.25s
F = 2414 N
Answer:
1. True
2. True
3. False
4. False
5. True
6. False
Explanation:
Acceleration: It refers to the change in velocity/speed of an object with respect to time. When the speed increases with time we call it acceleration and when its decreases it is called as deceleration. Let us analyze each instance individually:
1. When roller coaster starts to roll down the track its speed will increase with time. That means it is accelerating.
2. When the ball reaches at the peak of its trajectory, it comes to a stop for a fraction of a second that means it decelerates.
3. Since the velocity remains constant there is no acceleration.
4. Since the speed is no changing with time, there is no acceleration.
5. Since the moving plane comes to a stop, it is a case of deceleration.
6. Since the truck is moving at a constant speed so the acceleration is zero.
I think it’s the last one
Hope this helps
The speed for a curve of a given radius is proportional to the square root of the coefficient of static friction. The allowed speed in the second curve is about
(20 m/s)√(0.7/1.1) ≈ 15.95 m/s
-5 W is the heat flows through the slab in one day
Explanation:
- The heat transferred is directly proportional to the area of the material and the temperature differences in the body, whereas the heat transfer is inversely proportional to the length of the material
- The equation can be written as
where Q is the heat transfer, k is the thermal conductivity of the material, A is the area of the material and T is the difference in the temperature and the l is the length of the material. - Given that, A= 100
, l= 2 cm, k = 0.1 J/S. m. c and T= 100 degree Celsius - Substitute these values in the equation, you will get Q= -5 W
