Topic
Q:
The gravitational force between two electrons that are 1.65 km apart is \( 5.54 \times 10^{\wedge}-71 \)
N. Find the mass of the electron. (5pts)
Q:
02. Sejam três resistores de resistências \( 2 \Omega, 3 \Omega \) e \( 1 \Omega \), ligadas
em série e alimentadas por uma bateria de 12 V . Calcule:
a) a resistência equivalente do circuito.
b) a corrente no circuito.
c) a ddp em cada resistor.
Q:
Q. 8 An object has a position given by \( x=1.24 \mathrm{~m} / \mathrm{s} \mathrm{t}^{4} \). What is the is the acceleration of the
particle?
Q. 9 (a) State Newton's Laws of Motion
(b) A car is travelling with velocity of \( 10.2 \mathrm{~m} / \mathrm{s} \) and acceleration at \( 1.68 \mathrm{~m} / \mathrm{s}^{2} \) in the direction
it is travelling. How long does it take to travel 389 m ?
Q:
Q. 8 An object has a position given by \( x=1.24 \mathrm{~m} / \mathrm{s} \mathrm{t}^{4} \). What is the is the acceleration of the
particle?
Q. 9 (a) State Newton's Laws of Motion
(b) A car is travelling with velocity of \( 10.2 \mathrm{~m} / \mathrm{s} \) and acceleration at \( 1.68 \mathrm{~m} / \mathrm{s}^{2} \) in the direction
it is travelling. How long does it take to travel 389 m ?
Q:
Prove that \( \vec{V}=V_{x} \hat{\mathbf{i}}+V_{y} \hat{\mathbf{j}} \mid+\vec{V}_{z} \mathbf{k} \)
Q:
Q. 2 A gas has a temperature gradient such that the relationship between pressure and
density is given by the relationship: \( \rho=\mathrm{c} \mathrm{P}^{2} \) in such a gas with a uniform H is \( \mathrm{P}_{\mathrm{o}} \) and the
density at the top temperature, the pressure at the top of a column of height of the column is
\( \rho_{0} \).
What are the:
(i) Pressure, and
(ii) Density at the bottom of this column?
Q:
(E) A motorcyclist \( M \) leaves a road junction at time \( t=0 \). She accelerates from rest at a rate of
\( 3 \mathrm{~ms}^{-2} \) for 8 s and then maintains the velocity she has reached. A car \( C \) leaves the same mad
junction as \( M \) at time \( t=0 \). The car accelerates from rest to \( 30 \mathrm{~ms}^{-1} \) in 20 sand them maintains
the velocity of \( 30 \mathrm{~ms}^{-1} \). C passes \( M \) as they both pass a pedestrian.
a On the same diagram, sketch speed-time graphs to illustrate.
the motion of \( M \) and \( C \).
Q:
An astronaut has a mass of 70 kg on Earth.
What is the relationship between the mass and the weight of the astronaut
on the moon?
A The mass and the weight will both remain the same.
B The mass and the weight will both become less.
C The mass will be the same and the weight will be less.
D The mass will be less and the weight will be the same.
Q:
Q. 2 A gas has a temperature gradient such that the relationship between pressure and
density is given by the relationship: \( \rho=c P^{2} \) in such a gas with a uniform \( H \) is \( P_{o} \) and the
density at the top temperature, the pressure at the top of a column of height of the column is
\( \rho_{0} \).
What are the:
(i) Pressure, and
(ii) Density at the bottom of this column?
Q:
Q. 6 If \( \mathrm{A}=2 \mathrm{i}-3 \mathrm{j}+4 \mathrm{k} \) and \( \mathrm{B}=\mathrm{i}+2 \mathrm{j}+5 \mathrm{k} \), \( \quad \) (i) Evaluate AB
Q. 7 (a) Differentiate between Instantancous Velocity and Instantaneous Accelcration (b) The
position of an objeet is given as \( \mathrm{x}=2.3 \mathrm{~m}+1.4 \mathrm{~m} / \mathrm{s} \mathrm{t}+0.65 \mathrm{~m} / \mathrm{s} \mathrm{t}^{3} \). Calculate the velocity as a
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