Sc (21) , Y (39) , La (57) , Ce (58) , Pr (59) , Nd (60) , Pm (61) , Sm (62) , Eu (63) , Gd (64) , Tb (65) , etc (hoped that helped)
Answer:
option a is correct
net force = 28.7 N and 70º
Explanation:
given data
first force= 17.0 N
angle = 58.0º
2nd force = -19.0 N and 12.5 N
to find out
magnitude and direction net force
solution
we know here 1st force is at angle 58.0º is 17 N
so here x component of force is F1 cosθ and y component of force is F1 sinθ
so 1st force
x component of force = F1 cosθ = 17 cos(58) = 9.0086 N ...............1
y component of force = F1 sinθ = 17 sin(58) = 14.4168 N ..............2
and 2nd force
x component of force = -19 N .................3
y component of force = 12.5 N ..................4
so net force is
net force = √(Fx²+Fy²)
net force = √((9-19)²+(14.41+12.5)²)
net force = 28.7 N
and
magnitude
tanθ = Fy / Fx
tanθ = 26.92 / 10
θ = 70º
so option a is correct
2.89watts.
<h3>What is meant by sound intensity?</h3>
- The average rate at which sound energy moves across a unit area normal to a given direction is used to determine a sound's intensity. This rate is generally stated in ergs per second per square centimeter.
- Decibels are the units used to measure sound intensity, often known as sound power or sound pressure. The decibel (dB) unit is named after Alexander Graham Bell, who also created the audiometer and the telephone. An audiometer is a tool to gauge a person's hearing capacity for various noises.
- Our ability to measure the flow of sound energy as a time-averaged vector quantity makes sound intensity measuring an effective method. We can identify sound sources and tell direct sound from reverberant sound in a room using the characteristics of sound intensity.
How much power is radiated as a sound from a band whose intensity is 1.6x10-3 w/m2 at a distance of 12m:
Formula: 
I=1.6x10-3 w/m2
r=12m
To learn more about sound intensity, refer to:
brainly.com/question/17062836
#SPJ9
Answer:
c. Y
Explanation:
Newton's third law of motion states that action and reaction are equal and opposite. Hence for every action, there is an equal and opposite reaction.
Considering the system of forces shown in the image, W and Y are opposite forces. When the driver slams on the brakes, he will be pushed forward towards the windscreen. The force Y exerted by the seat belt keeps him on the drivers seat by moving him backwards towards the seat.
