Answer:
a) 72.54° and It will take the woman 33.4m
Explanation:
The woman runs with a constant speed V1 = 6m/s
V2 = 20m/s
V1 = V2 cos θ
Cos θ= V1/V2= 6/20
Cos θ= 0.3
Cos^-1 0.3=72.54°
Using Range formular for projectile
R= (V2 Cos θ)/g (V2 Sin θ)^2 +sqrt(V2 Sin θ)^2 + 2gh)
R= (20cos72.54)(2Sin72.54+sqrt(20Sin72.54)^2 + 2×9.8×45
R=33.4m
b )
see the attached file
Answer:
0.15m/s
Explanation:
Momentum p = mv, must be conserved if there are no external forces acting on the system. Since there are only internal forces acting between the bullet and the gun, momentum must be conserved.
The total momentum before the gun is fired:
The total momentum after the gun is fired, must also be zero:
Solving for v:
The recoil speed is the absolute value of the velocity.
In this graph, what is the displacement of the particle in the last two seconds?of the particle in the last two seconds?
<span>0.2 meters
2 meters
4 meters
6 meters</span>
In this graph, the displacement of the particle in the last two seconds is 2 meters.
Answer:
B. The force would be the same in both cases.
Explanation:
According to Newton's 3rd law where impulse was equated to the momentum formula.
F × t = M × V
where,
Force = F
V = velocity
Since, Impulse is force multiplied by time, whereas the time of contact is the same for both, therefore the impulse is the same in magnitude for the two trucks.
Case 1: Hitting the other car
Case 2: Hitting the brick wall
In Case 1, both the cars are identical and have same velocity whereas in the Case 2, the wall is stationary.
The case of hitting the brick wall have the same impact force as hitting the other car, because they have the same change in momentum.
Therefore, The force would be the same in both cases.
Answer:
The leaf cells would be unable to convert the sun's energy to make food.
Explanation:
The chloroplast in the leaf are used to make food for the plant. If the leaf loses its chloroplast, the leaf with not be able to use solar energy to manufacture their food.
- During photosynthesis, green plants manufacture their food.
- They use sunlight to cause a reaction between carbon dioxide and water.
- The sunlight is trapped using chlorophyll present in the leaf.
- In the absence of the chlorophyll contained in the chloroplast, no solar energy would be generated to cause the reaction to take place.
