Answer:
the wagon should be used as frame of reference if an observer said the child was not moving.
Explanation:
The state of motion of a body depends upon the frame of reference. It is the set of co-ordinates according to which the motion is analyzed. If a child is riding in a wagon, then he will be considered in motion to a person standing outside the wagon. Hence, if we take a frame of reference outside the wagon then the child must be in motion with respect to the observer. On the other hand if the observer is inside the wagon, then the child must be in rest with respect to the observer. Hence, if we take the wagon to be the frame of reference, then the child will be at rest with respect to the observer.
<u>Therefore, the wagon should be used as frame of reference if an observer said the child was not moving.</u>
Weight is force.
The metric unit of force is the Newton.
1 Newton is the force needed to accelerate 1 kilogram at the rate of 1 m/s² .
Answer:
1.176m
Explanation:
Local ambient pressure(P1) = 100 kPa
Absolute pressure(P2)=260kPa
Net pressure=absolute pressure-local ambient absolute pressure
Net pressure=P1(absolute pressure)-P2(local ambient absolute pressure)
Net pressure=260-100=160kPa
Pressure= ρgh
160kPa=13600*10*h
h=
h=1.176m
Answer: c) Yes, since the choice of the zero of potential energy is arbitrary.
Explanation:
Potential energy depends on the frame in which you are looking at the system.
For example, the potential energy of a lifted object can be written as:
U = mgh
where m is the mass, g is the gravitational acceleration and h is the height of the object.
But the height depends on where we have the zero if the zero is in the ground, then and h = 5m, then the potential energy is positive, but the 0 is the ground of a cliff, and the object is falling down the cliff, then we will have a negative value for h, which implies that we have negative potential energy.
This means that if we want to make the potential energy equal to zero, we must apply kinetic energy to the object (for example, grabbing it and throwing it upwards). On the other hand, if the potential energy is positive, this means that the object will "produce" kinetic energy as the potential energy starts to decrease. For example, an object that is dropped from a three (with an initial kinetic energy of zero) and only potential energy, and as the object falls to the ground the potential energy goes to zero and transforms completely in kinetic energy.
0.75 km = (0.75×100000) cm = 75000 cm
The scientific notation to find this is ---
Kilo-Hecto-Deca-Meter-Deci-Centi-Milli
