The best answer would be:
B. Epi pen
Here is more about it:
An epi pen injects epinephrine into the body to counteract the effects of an allergic reaction. Epinephrine helps narrow blood vessels and open up the airways. This can be used for food allergies, insect bites, and some other allergens. It is very effective and immediately works, but it is short-lived, so seeking medical attention after is still needed.
I recently did this topic in science class - the answer is A ;)
<span>Since the wheel start from rest. angular acceleration,
θ=1/2αt²
14=1/2α x 8.7²
α= 0.3699 rad/s²
moment of inertia of loop= mr²= 4.1x0.37=1.517 kgm²
torque=T= lα
T= 0.5611Nm= 0.56Nm to significant figure
Disc
moment of inertia of disc= 1/2mr²
Required torque value= 0.28Nm
So,
I= 1/2X 4.1X 0.37²= 0.280 Kgm²
T= Iα = 0.280 X 0.3699= 0.10 to two significant figure</span>
Answer:
number of coulombs = 1.28 ×
option b is correct
Explanation:
Given data
area A = 4cm
rate of hole r = 1000 cm/s
length L = 2mm
to find out
number of coulombs
solution
we will apply here number of coulombs formula that is
number of coulombs = e×A×L× r
put here value e = 1.6 ×
coulombs
and A = 4 ×
mand length = 2 ×
m
number of coulombs = 1.6 ×
× 4 ×
× 2 ×
× 1000
number of coulombs = 1.28 ×
so option b is correct
Answer:
511.1 J
Explanation:
We are given that
Mass of wood block=m=3 kg
Vertical distance,h=23 m
Horizontal distance =x=30 m
Distance traveled in downward direction y=40 m
Initial velocity,u=0

Where 






By work energy theorem
Change in kinetic energy=Work done= mgh-W



Hence, the work done due to friction on the block as it slides down the ramp=511.1 J