A suspicious-looking man runs as fast as he can along a moving sidewalk from one end to the other, taking 2.50 s. Then security
2 answers:
Answer:
The ratio of the man's running speed to the sidewalk's speed: 5: 26.
Explanation:
Let the distance between the sidewalk from one end to the other be x
Distance covered by the man = x
Time taken by the person to cover x distance = 2.50 seconds
Speed of the man while running to other end point = S
..[1]
Distance covered by the man by running back to his starting point after agents appears = x
Time taken by the person to cover x distance after agents appears = 13.0 seconds
Speed of the man while running back to starting point after agents appears = S'
...[2]
The ratio of the man's running speed to the sidewalk's speed:
[2] ÷ [1]
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Answer:
a = 1 m/s² and
Explanation:
The first two parts can be seen in attachment
We use Newton's second law on each axis
Y axis
Ty - W = 0
Ty = w
X axis
Tx = m a
With trigonometry we find the components of tension
Sin θ = Ty / T
Ty = T sin θ
Cos θ = Tx / T
Tx = T cos θ
We calculate the acceleration with kinematics
Vf = Vo + a t
a = (Vf -Vo) / t
a = (20 -10) / 10
a = 1 m/s²
We substitute in Newton's equations
T Sin θ = mg
T cos θ = ma
We divide the two equations
Tan θ = g / a
θ = tan⁻¹ (g / a)
θ = tan⁻¹ (9.8 / 1)
θ = 84º
We see that in the expression of the angle the mass does not appear therefore you should not change the angle
Answer:b
Explanation:
Given
mass of heavy object is 4m
mass of lighter object is m
A person pushes each block with same force F
According to Work Energy theorem Change in kinetic energy of object is equal to Work done by all the object
As launching velocity is same for both the object so heavier mass must possess greater kinetic energy . For same force heavier mass must be pushed 4 times farther than the light block .
So the correct option is b