Answer:
Forces always occur in pairs. If a force is exerted on an object there will always be another force, equal in size, acting in the opposite direction .
The ball will take 3 seconds to get to the top of its trajectory When it is launched from the ground with a horizontal speed of 30 m/s and a vertical speed of 30 m/s
<h3>What is Trajectory ?</h3>
When any object is thrown from horizontal at an angle θ except 90°, then the path followed by it is called trajectory, the object is called projectile and its motion is called projectile motion.
Here, we have a type of motion called projectile motion and it is pretty similar to an upside down parabola. The top of the trajectory is the vertex of the parabola and is also when v = 0.
Given :
- Horizontal speed= 30m/s
- Vertical Speed= 30 m/s
This problem is now relatively easy because we only need to find the vertical distance so we can ignore horizontal speed and use
vy = vy0 + ayt
Plug in our givens
0 = 30 - 10t
solve for t
t = 3 seconds
Hence, The ball will take 3 seconds to get to the top of its trajectory When it is launched from the ground with a horizontal speed of 30 m/s and a vertical speed of 30 m/s
Learn more about Projectile motion here ;
brainly.com/question/11049671
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Answer:
a. -4.166 J/K
b. 8.37 J/K
c. 4.21 J/K
d. entropy always increases.
Explanation:
Given :
Temperature at hot reservoir , 
= 720 K
Temperature at cold reservoir , 
= 358 K
Transfer of heat, dQ = 3.00 kJ = 3000 J
(a). In the hot reservoir, the change of entropy is given by:
(the negative sign shows the loss of heat)
= -4.166 J/K
(b) In the cold reservoir, the change of entropy is given by:
= 8.37 J/K
(c). The entropy change in the universe is given by:
= -4.16+8.37
= 4.21 J/K
(d). According to the concept of entropy, the entropy of the universe is always increasing and never decreasing for an irreversible process. If the entropy of universe decreases, it violates the laws of thermodynamics. Hence, in part (c), the result have to be positive.
<h2>
Answer:</h2>
<em>Hey,</em>
<h3><u>QUESTION)</u></h3>
The ball is only subject to its own weight, so according to Newton's first law, there is :
Thus, knowing the theta value, we can find the maximum altitude by replacing t in the equation for y with the expression above.
Answer:
1. The formula for speed is speed = distance ÷ time. To work out what the units are for speed, you need to know the units for distance and time
2. 36÷4= 9
(formula) Speed = distance ÷ time
3. Meter (M) centimeter (cm) kilometers (km)
4. Seconds , Hour, Minute
5. 65÷13=5 (object A)
125÷ 25= 5 (object B)
their both Equal of the amount of speed, so they are travelling at the same speed
Hope I helped
