Answer:
The net force on the object is zero.
Explanation:
An object is moving with constant non-zero velocity. If velocity is constant, it means that the change in velocity is equal to 0. As a result, acceleration of the object is equal to 0. Net force is the product of mass and acceleration. Hence, the correct option is (d) "The net force on the object is zero".
Answer
mass of a person is 80 kg
a) Mexico City, Mexico
acceleration due to gravity in mexico = 9.776 m/s²
weight = 80 × 9.776 = 782.08 N
b) Cape Town, South Africa
acceleration due to gravity in cape town = 9.796 m/s²
weight = 80 × 9.796 = 783.68 N
c) Tokyo, Japan
acceleration due to gravity in cape town = 9.798 m/s²
weight = 80 × 9.798 = 783.84 N
d) Chicago, IL
acceleration due to gravity in cape town = 9.803 m/s²
weight = 80 × 9.803 = 784.24 N
e) Copenhagen, Denmark
acceleration due to gravity in cape town = 9.815 m/s²
weight = 80 × 9.815 = 785.2 N
Answer:
the work is done by the gas on the environment -is W= - 3534.94 J (since the initial pressure is lower than the atmospheric pressure , it needs external work to expand)
Explanation:
assuming ideal gas behaviour of the gas , the equation for ideal gas is
P*V=n*R*T
where
P = absolute pressure
V= volume
T= absolute temperature
n= number of moles of gas
R= ideal gas constant = 8.314 J/mol K
P=n*R*T/V
the work that is done by the gas is calculated through
W=∫pdV= ∫ (n*R*T/V) dV
for an isothermal process T=constant and since the piston is closed vessel also n=constant during the process then denoting 1 and 2 for initial and final state respectively:
W=∫pdV= ∫ (n*R*T/V) dV = n*R*T ∫(1/V) dV = n*R*T * ln (V₂/V₁)
since
P₁=n*R*T/V₁
P₂=n*R*T/V₂
dividing both equations
V₂/V₁ = P₁/P₂
W= n*R*T * ln (V₂/V₁) = n*R*T * ln (P₁/P₂ )
replacing values
P₁=n*R*T/V₁ = 2 moles* 8.314 J/mol K* 300K / 0.1 m3= 49884 Pa
since P₂ = 1 atm = 101325 Pa
W= n*R*T * ln (P₁/P₂ ) = 2 mol * 8.314 J/mol K * 300K * (49884 Pa/101325 Pa) = -3534.94 J
Answer:
The average speed of the bear is 5.3 km/h.
Explanation:
Hi there!
The average <u>speed</u> is calculated as the distance traveled divided by the time in which that distance was covered. The bear traveled 4 km (1 km south, 1 km east, 1 km north and 1 km west) in 45 min. It does not matter the direction at which the bear traveled, only how much distance the bear moved. So the average speed (a.s) will be:
a.s = d/t
Where:
d = traveled distance.
t = time in which that distance was covered.
The average speed of the bear is 5.3 km/h.
Notice that if the question would have asked to find the average <u>velocity,</u> the answer would have been zero because the total displacement of the bear was zero (it returned to the initial point). The average velocity is calculated as the displacement over time.
Answer:
Objects are pulled toward earth
Objects travel at a rate of 9.8m/s
Explanation:
these are the only one that I know. sry :(
