A flea jumps by exerting a force of 1.20 × 10 − 5 N straight down on the ground. A breeze blowing on the flea parallel to the ground exerts a force of 0.500 × 10 − 6 N on the flea. Find the direction and magnitude of the acceleration of the flea if its mass is 6.00 × 10 − 7 kg. Do not neglect the gravitational force.
A flea jumps by exerting a force of 1.20 × 10 − 5 N straight down on the ground. A breeze blowing on the flea parallel to the ground exerts a force of 0.500 × 10 − 6 N on the flea. Find the direction and magnitude of the acceleration of the flea if its mass is 6.00 × 10 − 7 kg. Do not neglect the gravitational force.
A flea jumps by exerting a force of
1.20
×
10
−
5
N straight down on the ground. A breeze blowing on the flea parallel to the ground exerts a force of
0.500
×
10
−
6
N on the flea. Find the direction and magnitude of the acceleration of the flea if its mass is
6.00
×
10
−
7
kg. Do not neglect the gravitational force.
What is the current, in amps, across a conductor that has a resistance of10 Ω and a voltage of 20 V?
2. A conductor draws a current of 100 A and a resistance of 5 Ω. What is thevoltageacross the conductor?
3. What is the resistance, in ohm’s, of a conductor that has a voltage of 80 kVand acurrent of 200 mA?
4. An x-ray imaging system that draws a current of 90 A is supplied with 220V. What is the power consumed?
5. An x-ray is produced using 800 mA and 100 kV. What is the powerconsumed in kilowatts?
Part C
Find the height yi
from which the rock was launched.
Express your answer in meters to three significant figures.
Learning Goal:
To practice Problem-Solving Strategy 4.1 for projectile motion problems.
A rock thrown with speed 12.0 m/s and launch angle 30.0 ∘ (above the horizontal) travels a horizontal distance of d = 19.0 m before hitting the ground. From what height was the rock thrown? Use the value g = 9.800 m/s2 for the free-fall acceleration.
PROBLEM-SOLVING STRATEGY 4.1 Projectile motion problems
MODEL: Is it reasonable to ignore air resistance? If so, use the projectile motion model.
VISUALIZE: Establish a coordinate system with the x-axis horizontal and the y-axis vertical. Define symbols and identify what the problem is trying to find. For a launch at angle θ, the initial velocity components are vix=v0cosθ and viy=v0sinθ.
SOLVE: The acceleration is known: ax=0 and ay=−g. Thus, the problem becomes one of…
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
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