Answer:
c) F = 16000 N
Explanation:
For this exercise we use Newton's second law
F = ma
they tell us that adding the other wagons the acceleration of the locomotive must be maintained
F = m a
by adding the other four wagons
mass = 4 no
therefore to maintain the force you must also raise the same factor
Fe = 4Fo
Fe = 4 4000
F = 16000 N
Answer: the image distance is -18, 28 cm this means behind of the concave mirror. The image size is 2.2 higher that the original so it has 8.8 cm with the same orientation as original and it is a virtual imagen.
Explanation: In order to sove the imagen formation for a concave mirror we have to use the following equation:
1/p+1/q=1/f where p and q represents the distance to the mirror for the object and imagen, respectively. f is the focal length for the concave mirror.
replacing the values we obtain:
1/8.3+1/q=1/15.2
so 1/q=(1/15.2)-(1/8.3)=-54.7*10^-3
then q=-18.28 cm
The magnification is given by M=-q/p=-(-18,28)/8.3= 2.2
We also add a picture to see the imagen formation for this case.
Average speed = (distance covered) / (time to cover the distance)
= (30km + 40 km) / (25min + 35min)
= (70 km) / (60 min)
= 70 km/hour
Answer: 1.91 hours or 1 hour and 55 minutes
Procedure:
Average speed = distance / time
=> time = distance / average speed
=> distance = 1800 km / 940 km/h = 1.91 hours
0.91 hours * 60 min / hour = 54.9 min = 55 min
=> 1 hour and 55 min.
Answer:
F = 1200 N
General Formulas and Concepts:
<u>Forces</u>
Newton's Second Law of Motion: F = ma
- F is force (in N)
- m is mass (in kg)
- a is acceleration (in m/s²)
Explanation:
<u>Step 1: Define</u>
<em>Identify variables</em>
<em>m</em> = 300 kg
<em>a</em> = 4 m/s²
<u>Step 2: Find Force</u>
- Substitute in variables [Newton's Second Law of Motion]: F = (300 kg)(4 m/s²)
- Multiply: F = 1200 N
Topic: AP Physics 1 - Algebra Based
Unit: Forces
