Answer:
900J
Explanation:
w =f×s
60×15
=900J
thus the k.e of the body is 900j
Okay, so the density of water is 1g/cm3. In order for the cube to float, it has to be less than 1, and it will sink if it is more than 1 g/cm3. Use a triple beam balance to weigh the cube, looking at the metric ruler on the balance. Then, if the cube's density is more than 1, then you know it will float. If the density is less than 1, you know it will sink.
hope this helps, and I didn't know how to use the word "metric ruler"
Answer:
Explanation:
ratio of the forces is equal to the ratio of the surface areas
which is another way of saying the pressure is constant in the system
2000(9.8) / 500 = A / 10
A = 2000(9.8)(10) / 500 = 392 cm²
<h2>
Kinetic energy of mass 4 kg ball is less than kinetic energy of mass 2 kg ball</h2>
Explanation:
Kinetic energy = 0.5 x Mass x Velocity²
For ball of mass 2 kg
Mass, m = 2 kg
Velocity, v = 4 m/s
Kinetic energy = 0.5 x 2 x 4² = 16 J
For ball of mass 4 kg
Mass, m = 4 kg
Velocity, v = 2 m/s
Kinetic energy = 0.5 x 4 x 2² = 8 J
Kinetic energy of mass 4 kg ball is less than kinetic energy of mass 2 kg ball
Answer:
F = 64.0 N
the magnitude of the force is 64 N
Explanation:
Given;
Mass m = 45kg
time t = 7.5 s
Displacement d = 40 m
Force = mass × acceleration
F = ma ........1
From equation of motion;
d = vt + 0.5at^2
Since initial velocity v = 0 (initially at rest)
d = 0.5at^2
Making a the subject of formula;
a = d/(0.5t^2)
Substituting the given values;
a = 40/(0.5×7.5^2)
a = 1.42 m/s^2
From equation 1;
F = ma
Substituting the given values;
Force F = 45 kg × 1.42 m/s^2
F = 64.0 N
the magnitude of the force is 64 N
