Answer:
It is D (20 N in direction of boy’s push; 4 m/s/s)
Explanation:
<u>F=ma</u>
F: force
m: mass
a: acceleration
"5 kg box" means the box was 5 kg in mass
"force of 25 N and 5 N frictional force" means the box had force of 25 N and opposite force of 5 N. Let's say the box moved to right with 25 N. Think as integers. 25 to the right means positive. On a number line, the right side has positive numbers while left side has negative numbers. So since it moved to the RIGHT it means positive 25. But there was a frictional force of 5 to the opposite side. If you add 25 and -5, you will get 20. 25+(-5) is same as 25-5. So now you have 20 N, but we don't know the acceleration, so leave that as a variable. Then plug into the equation.
F=ma
20=5a
divide both sides by 5
4=a
the acceleration of the box was 4m/s/s
Answer:
Bulbs that heat a gas or a filament will heat up more than other light sources.
Explanation:
Incandescent bulbs are consist of thin wire known as filament which converts electric current into light. These filaments are made up of tungsten metal. The filaments gets hot due to the passage of electric currents which turns the bulb up. Bulb starts glowing and produce light then.
There are many ways to convert electricity into light that is why some bulbs heat up more than others. Some of then are very efficient (converts electricity to light mainly) while others are less efficient (converts electricity to light as well as produce plenty of heat).
For example:
- Incandescent Bulbs -they get hot
- Compact Fluorescent Light Bulbs - they get a little bit hot
- Light Emitting Diode (LED) - they don’t get hot
- Halogen Bulbs (halogen gas) - they get extremely hot
Answer:
current in series is 1.33 mA
current in parallel is 5.48 mA
Explanation:
given data
voltage = 8 V
resistors R1 = 2.5 kilo ohms
resistors R2 = 3.5 kilo ohms
to given data
current flow
solution
current flow in series is express as
current = voltage / resistor
put here all value
current = 8 / (2.5 + 3.5)
current = 8 / 6
current = 1.33 mA
and
current flow in parallel is express as
current = voltage / resistor
put here all value
current = 8 / (1/ (1/2.5 + 1/3.5))
current = 8 / 1.45
current = 5.48 mA
Answer:
v₂ = 176.24 m/s
Explanation:
given,
angle of projectile = 45°
speed = v₁ = 150 m/s
for second trail
speed = v₂ = ?
angle of projectile = 37°
maximum height attained formula,
now,
now, equating both the equations
v₂² = 31061.79
v₂ = 176.24 m/s
velocity of projectile would be equal to v₂ = 176.24 m/s
Answer:
The direction of the induced current in the coil is clockwise
Explanation:
This is based on Lenz's law that states that the direction of the induced current opposes the magnetic field that produces it. As the magnetic field becomes stronger, the induced current in the coil moves in a clockwise direction in order to oppose the magnetic field.