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Physics 101 Mechanics Q&A Archive of May 15, 2023

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May 15 of 2023

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A photon with a frequency of 5.23 E14 Hz strikes a photoemissive surface whose work function is 1.75 eV. Planck's constant is 4.14 E−15 eV*s. Calculate the energy of the photon. Calculate the maximum kinetic energy of the ejected photoelectron. Calculate the threshhold frequency for the…
A 1. A force of \( 75 \mathrm{~N} \) is applied to a wrench in a counterclockwise direction at \( 60^{\circ} \) to the handle, \( 12 \mathrm{~cm} \) from the centre of the bolt. a) Calculate the magnitude of the torque. b) In what direction does the bolt move?
Numerade Numerade Labs Numerade ongle affect the maximum height e reached? Leaming Task 1: Flgure Analysis The motion of a projectile may be described in terms of range and the maximum height it reaches. But what affects these Below is a figure of the height reached and range covered by a…
a flywheel of mass 8 tons start from rest and get up a speed of 180 rpm in 3min . Find the average torque exerted on it if radius of gyration of the flywheel is 60cm
Consider a particle with energy ( E=p^{2} / 2 m ) moving in one dimension ( (x) ). The uncertainty in its location is ( Delta x ). Show that if ( Delta x Delta p>hbar ), then ( Delta E Delta t>hbar ), where ( (p / m) Delta t=Delta x )
1. A stone is catapulted into the air at an angle of \( 40.0^{\circ} \) above level ground. It reaches maximum height \( 1.20 \mathrm{~s} \) later. (a) What is its acceleration at the highest point? (b) What is its average acceleration in the first \( 1.20 \mathrm{~s} \) ? (c) Find the speed of…
Two concentric spherical conductive shells of radii 5 cm and 10 cm are charged with 4 μC and 1 μC, respectively. What is the electric potential at r=0, r=7.5cm, and r=15cm?
Two particles A and B are moving towards cach other on a straight line with equal speeds 5 m/s. At an instant that is assume t = 0s, distance between the particles is 100m. It is desired to move another particle C always maintaining a distance 40m from the particle A and 30m from the particle…
Paragraph for \( Q \). Nos. 10 to 13 Two particles \( A \) and \( B \) are moving towards cach other on a straight line with equal speeds \( 5 \mathrm{~m} / \mathrm{s} \). At an instant that is assume \( \mathrm{t}=0 \mathrm{~s} \), distance between the particles is \( 100 \mathrm{~m} \). It is…
8 How much capacitive \( Q \) must be provided by the capacitor bank in Fig given below in order to improve the power factor to unity (3)
(Question 1) An eccentric load is applied to a column as shown. Verify (show with clear calculations) the normal stress distribution given for the bottom of the column.
A two-branch duct system of circular duct from P6-8 is shown in Fig. 6-20. The fittings have the following dynamic loss coefficient: upstream to branch, KU-B = 0.13; elbow, KEL = 0.1. There is a negligible pressure loss in the straight-through section of the branch. Using the static regain…
1 . Which word describes a quantity with only magnitude?
Fast Track Answer 1. If \( f(x)=\left\{\begin{array}{cl}K x^{2}, & \text { if } x \leq 2 \\ 3, & \text { if } x>2\end{array}\right. \) is continuous, then find the ralue of \( K \). (H.B. 2012)
Additional Problems 73. About onc-third of the body of a person fluating in the Dead Sea will be above the waterline. Assuming that the human body density is \( 0.08 \mathrm{~g} / \mathrm{cm}^{3} \). Find the density of the water in the Dead Sea. Why is it so much greater than \( 1.0…
a force 100n acts on a square surface of edge length = 10 m , the pressure on the surface =
Which of the following observation of a stationary observer is correct if an object moves with a velocity that approaches the velocity of light? choices: A stationary observer will observe that the relative mass slightly decreases. A stationary observer will observe that the relative…
Two spaceships A and B, moving at constant speed of 0.8 c. Ship A moves away from the Sun and ship B moves towards the Sun. The captains of these ships measures the speed of light coming from Sun. Which of the following is correct? a.) Ship A measures it as less than c, and ship B measures…
Which of the following correctly compares special theory of relativity to general theory of relativity? a.)General relativity describes gravity, while special relativity provides a framework for translating physical events and laws into forms appropriate for any inertial frame of…
Bernoull's equation can be derived from the conservation of
Special theory of relativity states that physical laws are the same in frames of reference which _________. choices: a.) accelerate constantly b.) moves at constant speed c.)may accelerate or move at constant velocity d.)is always stationary
The speed of light varies with respect to the person who measures and how fast the person measures it. true or false
A train is traveling at high speed into the tunnel of length 80 m. With the train originally has a proper length of 100 m, two observers on both ends of the tunnel noticed that the train exactly fit within the tunnel. What could be the speed v of the train expressed in c? choices: a.) 0.87…
A spaceship is moving towards the Moon at a speed v= 0.5 c relative to the Moon. A laser is projected and strikes a lunar mirror then reflected back to the ship. What will be the speed of the reflected beam? choices: a.) 2.0 c b.) 1.5 c c.) c d.) 0.75 c
While a spaceship is moving away from the Earth at 0.9c speed it shines a light beam backward. An observer on Earth would see the light arriving at a speed of _____________. choices a.) 0.1 c b.)more than 0.1 c but less than c c.) c d.) more than c but less than 1.9 c
Prove that Wo^2 is equal to the squareroot of g/l
1)Mention, without elaboration, 4 aspects of knowledge that you have applied to analyse the stability and failure of the crane, and 1 limitation that you have learned to ensure stability or non-failure of the crane. So far, throughtout this 4 lesson I had learn about moment, CG by using the…
A partly filled beaker of water seats on a scale, and its weight is 2.30N. When a piece of metal suspended from a thread is totally immersed on the beaker (but not touching the bottom), the scale reads 2.75N. What is the volume of the metal?
3) A \( 10.0 \mathrm{~cm} \) tal object is placed in front of a concave of distance \( 24.00 \mathrm{~cm} \). If the focal length of the mirror is \( 8.00 \mathrm{~cm} \). a) Compute the value of \( 9^{* \prime} \)
SET B 1. A carpenter tosses a shingle off a \( 9.4 \mathrm{~m} \) high roof, giving it an initial horizontal velocity of \( 7.2 \mathrm{~m} / \mathrm{s} \). a. What is the final vertical velocity of the ball? b. How long does it take to reach the ground? c. How far does it move horizontally at…
It didnt have the anwsers I was looking for
1. Pa8a suhu \( 300^{\circ} \mathrm{C} \), tetapan lasu reals: siklopropana \( \rightarrow \) propllen arilah \( 2,4 \times 10^{-10} \mathrm{~s}^{-1} \), Qan paia \( 400^{\circ} \mathrm{C} \) aralah \( 1.16 \times 10^{-6} \mathrm{~s}^{-1} \). Tentikan nilai Ea. (energi Alatra?)
Find minimum friction coefficient so that the block M doesn't move.
Find minimum coefficient of friction needed so that the bigger block doesn't move
A homogeneous ladder 10 cm long, weighing 400 N, is in equilibrium, resting on a frictionless vertical wall at an angle of 53 degrees with the horizontal (. Draw the diagram of rotational and translational forces
2. on your arms or fingers such as bracelets, rings or watches because even if your unit is unplugged, there may still be some remaining electronic static discharge.
The graph below plots velocity vs. time for an object moving along a straight path. (a) What is the average acceleration of the object during the following time intervals? (Enter your answers in m/s2. Indicate the direction with the signs of your answers.) (i) 0 s to 9.00 s m/s2 (ii) 9.00 s to…
The brakes are applied to a moving car, causing it to uniformly slow down. While slowing, it moves a distance of 40.0 m in 8.10 s to a final velocity of 1.90 m/s, at which point the brakes are released. (a) What was its initial speed (in m/s), just before the brakes were applied? m/s (b) What…
A simple pendulum consists of a mass m suspended from a fixed point by a weight- less, extensionless rod of length /. Obtain the equation of motion and, in the approximation that sin 0 = 0, show that the natural frequency is wo= Vg/l, where g is the gravitational field strength. Discuss the…
At what banking angle should a 65 mi/hr corner have if it is 300 m in radius and no friction is to be used to get the car around the corner?
55. (a) Calculate the focal length of the mirror formed by the shiny back of a spoon that has a \( 3.00 \mathrm{~cm} \) radius of curvature. (b) What is its power in diopters?
Which quarks are found within a proton? u, d, d, u, u, d u, b, d u, t, d
An antiparticle has the same ________ as its elementary particle. charge orbit mass spin
What is the de Broglie wavelength of a bullet of mass 0.030 kg traveling at 540 m/s? Planck's Constant is 6.63 × 10−34 J ⋅ s.
A photon with a frequency of 5.23 E14 Hz strikes a photoemissive surface whose work function is 1.75 eV. Planck's constant is 4.14 E−15 eV*s. Calculate the energy of the photon. Calculate the maximum kinetic energy of the ejected photoelectron. Calculate the threshhold frequency for the…
Two concentric spherical conductive shells of radii 5 cm and 10 cm are charged with 4 μC and 1 μC, respectively. What is the electric potential at r=0, r=7.5cm, and r=15cm?
Which of the following observation of a stationary observer is correct if an object moves with a velocity that approaches the velocity of light? choices: A stationary observer will observe that the relative mass slightly decreases. A stationary observer will observe that the relative…
Two spaceships A and B, moving at constant speed of 0.8 c. Ship A moves away from the Sun and ship B moves towards the Sun. The captains of these ships measures the speed of light coming from Sun. Which of the following is correct? a.) Ship A measures it as less than c, and ship B measures…
Which of the following correctly compares special theory of relativity to general theory of relativity? a.)General relativity describes gravity, while special relativity provides a framework for translating physical events and laws into forms appropriate for any inertial frame of…
Special theory of relativity states that physical laws are the same in frames of reference which _________. choices: a.) accelerate constantly b.) moves at constant speed c.)may accelerate or move at constant velocity d.)is always stationary
The speed of light varies with respect to the person who measures and how fast the person measures it. true or false
A train is traveling at high speed into the tunnel of length 80 m. With the train originally has a proper length of 100 m, two observers on both ends of the tunnel noticed that the train exactly fit within the tunnel. What could be the speed v of the train expressed in c? choices: a.) 0.87…
A spaceship is moving towards the Moon at a speed v= 0.5 c relative to the Moon. A laser is projected and strikes a lunar mirror then reflected back to the ship. What will be the speed of the reflected beam? choices: a.) 2.0 c b.) 1.5 c c.) c d.) 0.75 c
While a spaceship is moving away from the Earth at 0.9c speed it shines a light beam backward. An observer on Earth would see the light arriving at a speed of _____________. choices a.) 0.1 c b.)more than 0.1 c but less than c c.) c d.) more than c but less than 1.9 c
Prove that Wo^2 is equal to the squareroot of g/l
A homogeneous ladder 10 cm long, weighing 400 N, is in equilibrium, resting on a frictionless vertical wall at an angle of 53 degrees with the horizontal (. Draw the diagram of rotational and translational forces
The graph below plots velocity vs. time for an object moving along a straight path. (a) What is the average acceleration of the object during the following time intervals? (Enter your answers in m/s2. Indicate the direction with the signs of your answers.) (i) 0 s to 9.00 s m/s2 (ii) 9.00 s to…
The brakes are applied to a moving car, causing it to uniformly slow down. While slowing, it moves a distance of 40.0 m in 8.10 s to a final velocity of 1.90 m/s, at which point the brakes are released. (a) What was its initial speed (in m/s), just before the brakes were applied? m/s (b) What…
At what banking angle should a 65 mi/hr corner have if it is 300 m in radius and no friction is to be used to get the car around the corner?
Which quarks are found within a proton? u, d, d, u, u, d u, b, d u, t, d
An antiparticle has the same ________ as its elementary particle. charge orbit mass spin
What is the de Broglie wavelength of a bullet of mass 0.030 kg traveling at 540 m/s? Planck's Constant is 6.63 × 10−34 J ⋅ s.