Answer:
m = 1
Explanation:
K.E = 8J
v = 4m/s
m = ?
Now,
K.E = 1÷2mv^2
8 = 1÷2 × m × (4)^2
8 = 1÷2 × m × 16
8 = m × 8
m × 8 = 8
m = 8 ÷ 8 = 1
m = 1
<h3>
<em><u>VERIFICATION</u></em><em><u>:</u></em></h3>
K.E. = 1÷2mv^2
K.E = 1÷2 × 1 × 4^2
K.E. = 8J
<u>-TheUnknownScientist</u>
Answer:
a) 
degrees
b) 
degrees
c) 
degrees
Explanation:
If we have a vector 
in a two dimensional space. The angle respect the x axis can be founded from the following expression:
And then the angle is given by:
Part a
Ax = 11 m and Ay = 11 m
For this case the angle would be:
degrees
Part b
Ax = 19 m and Ay = 11 m
For this case the angle would be:
degrees
Part c
Ax = 11 m and Ay = 19 m
For this case the angle would be:
degrees
Answer:
F= 5.71 N
Explanation:
width of door= 0.91 m
door closer torque on door= 5.2 Nm
In order to hold the door in open position we need to exert an equal and opposite torque, to the door closer torque, on the door.
so wee need to exert 5.2 Nm torque on the door.
If we want to apply minimum force to exert the required torque we need to apply force perpendicularly on the door knob (end of door) so that to to greater moment arm.
T= r x F
T= r F sin∅
F= T/ (r * sin∅)
F= 5.2/ (0.91 * 1)
F= 5.71 N
Answer: Sound waves are a waves of compression and rarefaction, by which sound is propagated in an elastic medium such as air.
Explanation:
In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.
Answer: 0.14 Hz
Explanation:
We are told the person counts 10 waves in 68 s, from this information we can calculate the frequency 
, which is defined as the number of oscilations or waves per unit of time. Then:
This is the frequency of the ocean waves. Now, according to the International System of Units (SI), frequency is measured in Hertz (
), which is equivalent to 
.
So, according to this, the frequency of the ocean waves is 
