Answer:
A. 0.289g/mL
Explanation:
Using the equation for density which is d = m/v or density = mass/volume, we input 1.3g/4.5mL and get 0.289g/mL.
Answer:
W = 0.49 N
τ = 0.4851 Nm
Force
Explanation:
The weight force can be found as:
W = mg
W = (0.05 kg)(9.8 m/s²)
<u>W = 0.49 N</u>
The torque about the pivot can be found as:
τ = W*d
where,
τ = torque
d = distance between weight and pivot = 99 cm = 0.99 m
Therefore,
τ = (0.49 N)(0.99 m)
<u>τ = 0.4851 Nm</u>
The pivot exerts a <u>FORCE </u>on the meter stick because the pivot applies force normally over the stick and has a zero distance from stick.
Answer: 3200 joules.
Explanation:
Mass of deer = 100kg
Speed of running deer = 8 m/s
Kinetic energy = ?
Kinetic energy is the energy possessed by a moving body (deer). It is measured in joules.
Thus, Kinetic energy = 1/2 x (Mass x velocity^2)
K.E = 1/2 x (100kg x (8m/s)^2)
K.E = 1/2 x (100 x 64)
= 0.5 x 6400
= 3200 joules
Thus, the kinetic energy of the running deer is 3200 joules.
The following choice that is NOT a way that machines provides a mechanical advantage is to change direction. The correct answer is A.
Answer:
I = 12*B (the information about B does not appear in the statement)
Explanation:
The motion of the segment of the circuit, in a constant magnetic field makes that opposite charges inside the segment separate of each other. This generate a induced potential difference at the ends of the segment that is given by the following formula:
(1)
v: speed of the segment = 2.0m/s
B: magnitude of the magnetic field
(2)
The induced current calculated by replacing the result of (2) in the following formula:
(3)
Then, you only have to replace the value of the magnitude of the magnetic field B in (3) to calculate the current.