Answer:
E) The centripetal force is always perpendicular to the velocity.
Explanation:
Due to gravity and inertia, the satellite follows a uniform circular motion. In this movement, the velocity is always tangent to the orbit and the centripetal force is directed towards the center. Therefore, there is no net acceleration in the same direction of velocity, which implies that it remains constant.
Answer:
Balanced force:
1. When force exerts on a body, they are of equal size.
2. They are if equal magnitude but opposite direction.
3. When force applied on object it remain stationary.
4. Net force is equal to zero.
Unbalanced force:
1. When force exerts on body, there size are not equal.
2. There magnitude are not equal.
3. It start moving when force applied.
4. Net force is not equal to zero.
Explanation:
Seismic refraction is the bending of the seismic waves as they pass geological layers of the earth due to different densities. This is especially true for Primary waves because they can pass through all the layers of the earth both liquid and solid.
Seismic reflectivity is the bouncing back of seismic waves at a boundary of geological layers due to different densities or subsurface formation. This is especially true for secondary waves that are unable to pass through liquid layers of the earth like the outer core and mantle. When they reach the boundary of these layers they bounce back towards the earth's surface.
These properties of P and S waves are used to ‘auscultate’ the epicenter of an earthquake by triangulation.
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Answer:
29.131 m/s
Explanation:
Draw a free body diagram. There are three forces: weight force mg pulling down, normal force N pushing perpendicular to the road, and friction force Nμ pushing parallel to the road downwards.
Sum of forces in the centripetal direction:
∑F = ma
N sin θ + Nμ cos θ = m v² / r
N (sin θ + μ cos θ) = m v² / r
Sum of forces in the vertical direction:
∑F = ma
N cos θ − Nμ sin θ − mg = 0
N (cos θ − μ sin θ) = mg
N = mg / (cos θ − μ sin θ)
Substituting:
mg (sin θ + μ cos θ) / (cos θ − μ sin θ) = m v² / r
g (sin θ + μ cos θ) / (cos θ − μ sin θ) = v² / r
v² = gr (sin θ + μ cos θ) / (cos θ − μ sin θ)
Plugging in values:
v² = (9.8 m/s²) (39 m) (sin 30° + 0.72 cos 30°) / (cos 30° − 0.72 sin 30°)
v = 29.131 m/s
Answer: this would be D.) What does a turntable built into a track look like
Explanation: