I need physics help!!
Answers
Answer: magnitude = 5 and angle = 160°
Explanation:
A vector has magnitude 5 and angle -20°
A vector can be written in terms of its components as :
using trigonometry identity:
sin θ = -sin ( 180 + θ )
cos θ = - cos (180 + θ)
Thus, we can write the same vector as:
Magnitude
Thus, the magnitude would be A = 5 and angle = 180+θ= 180-20 = 160°
Related Questions
The horizontal sweep of an oscilloscope is rated in
WHAT IS THE UNBALANCED FORCE THAT SLOWS DOWN SLIDING DESKS AND MOVING CARS
A battery uses _________________ energy to generate _______________ energy.
Humid air is a better electrical conductor than dry air. Explain why you are most likely to receive a shock after walking across a carpet when the air is dry than when the air is humid.
A bottle opener is a type of lever that reduces the input force required by reducing the distance over which the force is applied.
B.
A bottle opener is a type of lever that enables the same work to be done over a shorter distance with less force.
C.
A bottle opener is a lever in which a smaller input force acts over a larger distance so that a larger output force can act over a smaller distance.
D.
A bottle opener is a type of lever that magnifies the output force required.
Answers
Answers
________________________________________...
11) If Galileo had dropped a 5.0 kg cannon ball to the ground from a height of 12 m, the change in PE of the cannon ball would have been product of mass(m),acceleration(g)and height(h)
The change in PE =mgh=5*9.8*12=588 J
______________________________________...
12.) The 2000 Belmont Stakes winner, Commendable, ran the horse race at an average speed = v = 15.98 m/s.
Commendable and jockey Pat Day had a combined mass =M= 550.0 kg,
Their KE as they crossed the line=(1/2)Mv^2
Their KE as they crossed the line=0.5*550*(15.98)^2
Their KE as they crossed the line is 70224.11 J
______________________________________...
13)Brittany is changing the tire of her car on a steep hill of height =H= 20.0 m
She trips and drops the spare tire of mass = m = 10.0 kg,
The tire rolls down the hill with an intial speed = u = 2.00 m/s.
The height of top of the next hill = h = 5.00 m
Initial total mechanical energy =PE+KE=mgH+(1/2)mu^2
Initial total mechanical energy =mgH+(1/2)mu^2
Suppose the final speed at the top of second hill is v
Final total mechanical energy =PE+KE=mgh+(1/2)mv^2
As mechanical energy is conserved,
Final total mechanical energy =Initial total mechanical energy
mgh+(1/2)mv^2=mgH+(1/2)mu^2
v = sq rt [u^2+2g(H-h)]
v = sq rt [4+2*9.8(20-5)]
v = sq rt 298
v =17.2627 m/s
The speed of the tire at the top of the next hill is 17.2627 m/s
______________________________________...
14.) A Mexican jumping bean jumps with the aid of a small worm that lives inside the bean.
a.)The mass of bean = m = 2.0 g
Height up to which the been jumps = h = 1.0 cm from hand
Potential energy gained in reaching its highest point= mgh=1.96*10^-4 J or 1960 erg
b.) The speed as the bean lands back in the palm of your hand =v=sq rt2gh =sqrt 0.196 =0.4427 m/s or 44.27 cm/s
_____________________________
15.) A 500.-kg horse is standing at the top of a muddy hill on a rainy day. The hill is 100.0 m long with a vertical drop of 30.0 m. The pig slips and begins to slide down the hill.
The pig's speed a the bottom of the hill = sq rt 2gh = sq rt 2*9.8*30 =sq rt 588 =24.249 m/s
__________________________________
16.) While on the moon, the Apollo astronauts Neil Armstrong jumped up with an intitial speed 'u'of 1.51 m/s to a height 'h' of 0.700 m,
The gravitational acceleration he experienced = u^2/2h = 2.2801 /(2*0.7) = 1.629 m/s^2
______________________________________...
EDIT
1.) A train is accelerating at a rate = a = 2.0 km/hr/s.
Acceleration
Initial velocity = u = 20 km/hr,
Velocity after 30 seconds = v = u + at
Velocity after 30 seconds = v = 20 km/hr + 2 (km/hr/s)*30s =
Velocity after 30 seconds = v = 20 km/hr + 60 km/hr = 80 km/ hr
Velocity after 30 seconds = v = 80 km/hr=22.22 m/s
_______________________________-
2.) A runner achieves a velocity of 11.1 m/s 9 s after he begins.
His acceleration = a =11.1/9=1.233 m/s^2
Distance he covered = s = (1/2)at^2=49.95 m
Answers
Answer:
You should generally have one independent variable in an experiment. This is because it is the variable you are changing in order to observe the effects it has on the other variables.
HOPE THIS HELPED!!!!!!!!!!!!XDDDDDDDDD
-palm
-fingers
-back
-thumb
Answers
Answer: Palm
Explanation: When you have a wire, you must point your thumb in the direction in which the electricity is going, and now you close your palm, in the direction in which you closed your hand is in the direction in which points the magnetic field.
Then the correct option is the first one, the palm points in the direction of the magnetic field.
Answer:
Fingers
Explanation:
The index finger shows the moving charge, while your middle finger shows the magnetic field line.
Answers
SIMILAR not identical
Period - ever increasing proton number
Answer 2: elements in the same period have the same amount of energy levels (in which electrons orbit around the atomic nucleus)elements in the same group have the same number of valance electrons (which are found in the outer most energy level)
Answers
According to the law of conservation of mass of reactants before the reaction must be equal to the mass of the product. He is wrong because the nail is undergoing the process of rusting and after the rusting process mass of the product is increasing.
what is the law of conservation of mass?
According to the law of conservation of mass of reactants before the reaction must be equal to the mass of the product.
What is rusting?
Rusting is a form of oxidation. Rust is formed when iron combines with water and oxygen to generate hydrated ironoxide. Which is given by.
Nail contains iron when combined with oxygen results in the formation of ferrous oxide which is heavier than iron. That's why the mass of the product is more than the mass of reactants. ]
Hence after a few months seems larger and heavier than it was before.
To learn more about rusting refer to the link;