Explanation:
a. Mechanical advantage = force out / force in
MA = 830 / 100
MA = 8.3
b. Efficiency = work out / work in
0.80 = W / 600 J
W = 480 J
Answer:
0.96cm
Explanation:
Given parameters:
Weight of person = 645N
Pressure of the heel = 9000000PA
Unknown
Diameter of the circular base = ?
Solution
Pressure is the force per unit area of a body.
Pressure = 
To solve this problem, find the unknown area of the circle;
Pressure x Area = Force
Area = 
Area = 
= 7.17 x 10⁻⁵m²
Note: 1Pa = 1Nm⁻²
Now;
Area of a circle = π r²
r = 
Area = π x 
d is the diameter
d² = 4 x Area x (1/π)
d² = 4 x 7.17 x 10⁻⁵ x (1/3.14) = 9.13 x 10⁻⁵
d = 0.0096m
To cm;
100cm = 1m
0.0096m; 0.0096 x 100= 0.96cm
Answer:
200metters
Explanation:
because in one second hes going 10 metter in 20 second he will go 20×10=200
Answer:
|q1| / |q2| = 1/7
Explanation:
We are told that both particles are in the same magnetic field, B.
The charge of the first particle is q1
The charge of the second particle is q2
Let the speed of particle 1 be v1.
Let the speed of particle 2 be v2.
The magnetic force acting on particle 1 due to the magnetic field, B, is:
F1 = |q1| * v1 * B
The magnetic force acting on particle 2 due to the magnetic field, B, is:
F2 = |q2| * v2 * B
We are told that both particles experience the same magnetic force. This means that F1 = F2
Therefore:
|q1| * v1 * B = |q2| * v2 * B
=> |q1| * v1 = |q2| * v2
|q1| / |q2| = v2/v1
We are told that the speed of particle 1 is seven times that of particle 2. Hence:
v1 = 7 * v2
Hence:
|q1| / |q2| = v2 / (7 * v2)
|q1| / |q2| = 1/7
Pretty simple
The no atmosphere says that theres no air resistance, making the problem 10 times easier.
If the hammer is thrown upwards, it has a positive inital velocity of 14m/s
Now gravity is trying to pull it downwards so the accelerating is -3.5m/s^2 (closest planet I can think off with this acceleration is Mercury, but thats besides the point)
Anyways we can use kinematic equations to solve that
Vf = vi + at
Vf = 14m/s +(-3.5)(8)
Vf = -14 m/s
So after 8 seconds the ball is going downwards at the same height that you threw it.
answer : -14m/s or you can say 14m/s downwards
