Answer:
b)
Explanation:
Normal force, is always directed upward the surface over which is placed the object, and can adopt any value, as required to meet Newton's 2nd Law.
In this case, as the external force on the suitcase pulls upward, in order to counteract the influence of gravity, normal force is less than the weight of the suitcase, as follows:
F + Fn = m*g
⇒ Fn = m*g - F
So, the normal force is equal to the magnitude of the weight of the suitcase (m*g) minus the magnitude of the force of the pull (F) which is the same expressed by the statement b.
Answer:
Wg is positive and WT negative.
(Letters in options are all wrongly written).
Explanation:
Remember that the work of a force is the internal product between the force and the displacement .
Since the displacement is downwards like the weight, the work done by gravity is positive, while the work done by the tension is negative since it points upwards.
Answer:
Explanation:
Battery voltage is 6V
A current of 0.361A is draw the voltage reduces to, 5.07V
This shows that the appliances resistance that draws the currents is
Using KVL
The battery has an internal resistance r
V=Vr+Va
Vr is internal resistance voltage
Va is appliance voltage
6=5.07+Va
Va=6-5.07
Va=0.93
Using ohms law to the resistance of the appliance
Va=iR
R=Va/i
R=0.93/0.361
R=2.58ohms
Then if the circuit draws a current of 0.591A
Then the voltage across the load is
V=iR
Va=0.591×2.58
Va=1.52V
Then the voltage drop at the internal resistance is
V=Vr+Va
Vr=V-Va
Vr=6-1.52
Vr=4.48V
I want to examine the surface of a planet that is covered by a thick atmosphere (which includes oxygen and contains a very thick layer of water clouds that never clears). What wavelength of electromagnetic radiation would I be smartest to use: radar waves.
Radars send out electromagnetic waves much like wireless computer networks and cell phones. The signals are despatched out as short pulses which can be reflected by objects of their route, in part reflecting returned to the radar.
The radio waves travel outward from the antenna at the velocity of light (186,000 miles or three hundred,000 km in keeping with the second) and keep going until they hit something.
Then some of them bounce back in the direction of the antenna in a beam of contemplated radio waves also visiting at the speed of light. the speed of the waves is crucially vital.
Learn more about radio waves here: brainly.com/question/25904079
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