Which force is responsible for a car's decrease in velocity when brakes are applied? А gravity buoyancy inertia D. friction
Q: Which process happens inside a star? a) Electron Excitation b) Nuclear fusion c) Nuclear fission d) ...
A: QUESTION: Which process happens inside a star? OPTIONS: a) Electron Excitation b) Nuclear fusion c) ...
Q: How many fission takes place per second in a 300 MW reactor, assuming each fission releases 200 MeV ...
A: The correct option is d d) 9.38 x 1018
Q: Asappp
A: Boldface for vector notation According to Biot-Savart the magnetic field due to a line current eleme...
Q: Which of the following kinetic friction is smaller? a) Limiting friction b) Static friction c) Rolli...
A: Option c
Q: What would be the effect of a nuclear holocaust? a) Nuclear Summer b) Nuclear Spring c) Nuclear Autu...
A: Option d
Q: If gravitational constant is decreasing with time, what will remain unchanged in case of a satellite...
A: Gravitational constant that is g = GM/R. Now g is decreasing then, Time Period = 2pi/w (...
Q: There is some water in a beaker placed on the pan of a spring balance. If we dip our finger in this ...
A: B option
Q: 3. An instrument packaged is projected vertically upwards to collect data near the top of the earths...
A: Given: The altitude up to which the package is to be projected is 900 km.
Q: Which of the following is constant in projectile motion? a) Horizontal component b) Vertical compone...
A: Option a correct
Q: Determine the total moment at A.
A: 65 x 3 - 3 × 2 - 25 × 1.5
Q: The safety-rods present to shut down the reactor are made up of ____________ a) Copper b) Calcium c)...
A: QUESTION: The safety-rods present to shut down the reactor are made up of ____________ OPTIONS: a) C...
Q: The closest distance the light can go near the black hole and return back is called the ___________ ...
A: Option c
Q: Help me fast so that I will give Upvote.
A: The steady state heat conduction is given by the Laplace's equation. Solution of the Laplace's equat...
Q: The Eigen value of a particle in a box is ___________ a) L/2 b) 2/L c) L/2−−−√ d) 2/L−−−√
A: −−−√(2L)
Q: Raman effect is scattering of ________ a) Atoms b) Molecules c) Protons d) Photons
A: Option c protons
Q: A 4.0 kg object is raised 7 meters above the ground (on the earth). How high would the object have ...
A:
Q: You hold a 338 grams of coffee in a 267 gram porcelain cup which is too hot to drink at 85°C. You wa...
A:
Q: 2. An electron makes a transition from a 4f to a 1s state. What is the wavelength of the emitted pho...
A: the energy for a Bohr Atom is given by En=-13.6Z2n2 eVfor a H-atom, Z=1En=-13.6n2∆E=-13.61nf2-1ni2=-...
Q: What is the magnitude of a unit vector?
A: Unity
Q: While launching a rocket of mass 2×104 kg, a force of 5×105 N is applied for 20s. Calculate the velo...
A: Option c
Q: In elastic collision, 100% energy transfer takes place when ___________ a) m1=2m2 b) m1 is greater t...
A: Option d
Q: potential energy V(x). An alternate way of approaching this problem is by directly considering the r...
A: (a) We have been provided with the expression for restoring torque as- τ=-mglsinθ According to the q...
Q: In a 1.25 T magnetic field directed vertically upward, a particlehaving a charge of magnitude 8.50 m...
A: Part-a Given: The magnetic field B = 1.25 T. The charge on the particle q = 8.5 mC. The velocity of...
Q: If a star is about 10 times the earth’s sun, how will it change when it’s about to die? a) Explode b...
A: Option d is correct answer
Q: The radius of gold nucleus is 41.3fermi. Express its volume in m3. a) 41.3×10-15 m3 b) 2.95×10-40 m3...
A: Option
Q: A bullet of mass 0.04kg moving with a speed of 90m/s enters a wooden block and is stopped after a di...
A: m = 0.04kg, u = 90m/s v = 0, s = 60cm = 0.60m v2-u2 = 2as a = -6750m/s2 Therefore, retardation force...
Q: Calculate the increase in sound level resulting from using an ear trumpet to aid in hearing. Take th...
A: Given data: Area of the trumpet A1=900 cm2 Area of the eardrum A2=0.500 cm2 Efficiency of trumpet I1...
Q: The coefficient of kinetic friction is less than the coefficient of static friction. a) True b) Fals...
A: True
Q: 32. The masses of the objects with positions r1 = 10j (cm), r2 = 16i (cm) and r3 = 2i + 4j (cm) on t...
A: Given: The mass of the first object m1 = 0.5 kg. The mass of the second object m2 = 1 kg. The mass ...
Q: The piston is moving up the cylinder as shown, which of the following statements are true? Assuming ...
A: The control volume is seen in figure:
Q: Two forces whose magnitudes are in ratio of 3:5 give a resultant of 35N. If the angle of inclination...
A: Option
Q: During Bose-Einstein condensation all the atoms fall back to the _______ a) Ground state b) First ex...
A: Option a
Q: Mass of A is 4 times that of B. What is the ratio of their mean velocities? a) 1 : 4 b) 4 : 1 c) 1 :...
A: Option c
Q: Two identical balls A and B collide head on elastically. If velocities of A and B, before the collis...
A: Option d
Q: What is the rms speed of methane at 27℃? a) 450 m/s b) 532 m/s c) 678 m/s d) 745 m/s
A: Option c
Q: Most of the helium of the universe was produced __________ a) In stars b) In quasars c) At the time ...
A: Option d correct
Q: A bullet of mass m = 4g fires towards a wooden block of mass M = 1.996kg and collides completely ine...
A: Collision Collision is a phenomenon where two bodies interact among themselves by exchanging energie...
Q: A 1.2-m plank of mass 3 kg rests on two joists. Knowing that the coefficient of static friction betw...
A: Part-a The length of the plank l = 1.2 m. The mass of the plank m = 3 kg. The coefficient of static...
Q: A body can have energy without momentum. a) True b) False
A: Consider a ball is at rest on the table. Let m denotes the mass of the ball, h denotes the height of...
Q: The brightest star in a constellation _________ a) Alpha b) Omega c) Pulsar d) Beta
A: Alpha
Q: 7.37 To determine the viscosity of a liquid, one hangs up and small steel ball with the mass m and t...
A: Note: As per the policy, only the first question will be solved. If you want the solution to other p...
Q: To illustrate that the length of a smooth space curve does not depend on the parameterization used t...
A: The length of a parametrized curve r(t)=x(t)i +y(t) j + z(t) k is given by, ∫ ds=∫t1t2dx(t)dt2+dy(...
Q: The figure shows three circular arcs centered at the origin of a coordinate system. On each arc, the...
A:
Q: You are working as an intern for a meteorological laboratory. You are out in the field taking measur...
A:
Q: Lightning can be studied with a Van de Graaff generator, which consists of a spherical dome on which...
A:
Q: Sterdian is the SI unit of which of the following? a) Phase angle b) Luminous intensity c) Mass d) S...
A: Option d
Q: If gravitational constant is decreasing with time, what will remain unchanged in case of a satellite...
A: B
Q: An athlete in the Olympic game covers a distance of 100m in 10s. His kinetic energy can be estimated...
A: D option
Q: P9 E4
A: Given that: λ=540 nC= 540×10-9 C/mRadius , R=75 cm= 0.75 mzo=2.99 m
Q: A 7.80 g bullet is moving at 460 m/s just before it penetrates a tree trunk to a depth of 4.9 cm (ay...
A:
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