Answer:
Explanation:
work done=force * displacement
=500 N * 40 m
=2000 joule
Explanation:
003 (part 1 of 2)
Pressure is force divided by area.
P = F / A
P = (117 kg × 9.8 m/s²) / (2 × (0.05 m)²)
P = 229,320 Pa
003 (part 2 of 2)
There are approximately 6895 Pa in 1 psi.
P = 229,320 Pa × (1 psi / 6895 Pa)
P = 33.3 psi
004 (part 1 of 2)
Since the collisions are elastic, the angle of reflection is the same as the angle of incidence (it bounces off at the same angle).
Impulse = change in momentum
F Δt = m Δv
F (36 s) = (300 × 0.003 kg) (5.2 sin 57° m/s − (-5.2 sin 57° m/s))
F = 0.218 N
004 (part 2 of 2)
Pressure is force over area.
P = F / A
P = 0.218 N / 0.712 m²
P = 0.306 N/m²
The magnetic field lines
around a long wire which
carries an electric current
form concentric circles
around the wire. The
direction of the
magnetic field is
perpendicular to the wire
and is in the direction
the fingers of
your right hand
would curl if you
wrapped them
around the wire
with your
thumb in the direction
of the current.
hope it helps you
Linear momentum has to be conserved. It was zero before the thread eas burned ... when nothing was moving ... so the momentum of the masses moving in opposite directions has to add up to zero. ... Momentum = mass times speed. ... In one direction, you have 5 kg times 1/5 m/s= 1 kg-m/s. ... We need 1 kg-m/s in the other direction. ... 7 kg times speed = 1 kg-m/s. ... Can you finish it from here ?
Answer:
Ex1.
a) Carbon : atomic number Z = 6 and mass number A = 12
b) Protons = 6; electrons = 6 ; neutrons = 6.
Ex2.
Molar mass of H₂O₂ = 34 g; BaF = 156 g; CO = 28 g.
Explanation:
Ex1.
a) the element with atomic number 6 and mass number 12 is carbon
b) number of protons and electrons in a element is given by its atomic number; and for neutrons its mass number - atomic number (A-Z).
⇒ protons = Z = 6; electrons = Z = 6.; neutrons = A-Z = 12-6 = 6.
Ex2.
Molecular formula of hydrogen peroxide is given by H₂O₂.
⇒ molar mass = 2×mass of hydrogen + 2×mass of oxygen
⇒ molar mass = 2×1 + 2×16 = 34.g
molar mass of BaF = mass of barium + mass of fluoride.
= 137 + 19 = 156 g
molar mass of CO = mass of carbon + mass of oxygen
= 12 + 16 = 28 g