Answers edited by Jane

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• 2. A boy stands 10 m in front of a plane mirror . then be moves 3 m towards the mirror. How many metres does his image move towards him? A) 20 B) 14 C) 7 D) 6
  
• Question #2b83b
  
• Sand drops fall vertically at the rate of 3 kg/s on the conveyor belt moving horizontally with a speed of 0.25 m/s .the extra power required to keep it moving?
  
• An object with a mass of #9 kg# is on a ramp at an incline of #pi/12 #. If the object is being pushed up the ramp with a force of # 2 N#, what is the minimum coefficient of static friction needed for the object to remain put?
  
• Why HIV cannot spread through saliva?
  
• Question #354d2
  
• Question #9ed21
  
• A model train, with a mass of #6 kg#, is moving on a circular track with a radius of #1 m#. If the train's kinetic energy changes from #27 j# to #36 j#, by how much will the centripetal force applied by the tracks change by?
  
• Question #1e5b9
  
• Question #f6eef
  
• Question #6c539
  
• Question #45f7c
  
• Question #b7271
  
• Find the temperature increase in #""^@ "C"# expected for #"1.00 L"# of water when it absorbs all of the energy from the combustion of #"1.00 g"# of acetylene, #"C"_2"H"_2(g)#? (Every mole of acetylene releases #"1300 kJ"# of energy when combusted.)
  
• Question #e2a56
  
• Considering there is no friction , find the minimum angle #\alpha# for which the ball gets out of the hole.(answer: #\alpha=60# ; I want to know the full solution) (?)
  
• Question #943b7
  
• Please help?! Thanks
  
• The potential energy of a particle varies with distance as #U= (Asqrt(x))/(x^2 + B)#, where A and B are constants. The dimensional formula for #A * B# is?
  
• An object with a mass of #7 kg# is on a surface with a kinetic friction coefficient of # 8 #. How much force is necessary to accelerate the object horizontally at # 32 m/s^2#?
  
• Does the skin produce hormones that are essential for proper calcium absorption from the digestive tract, or does it produce calcitriol? If not, what role does the skin play in the process of calcium absorption?
  
• Can you explain the molecular theory of friction?
  
• Question #5c429
  
• What is GERD?
  
• Question #ea570
  
• Question #3d423
  
• Question #ff50e
  
• Question #93664
  
• Question #1ad48
  
• Question #5d67b
  
• A single conservative force Fx = (6.0x – 12) N (x is in m) acts on a particle moving along the x axis. The potential energy associated with this force is assigned a value of +20 J at x = 0. What is the potential energy at x = 3.0 m? a. +11 J
  
• In trapezium PQRS , PS||QR , SR perpendicular QR, angle Q = 130°find the measure of angle P and S?
  
• Question #31f43
  
• A body of 1 kg moves in a circle. At time=0 it moves with the velocity of 4 m/s and a force of 16 N is exerted on it. The force and the velocity share an angle of 60°. What is the velocity at t=1s and what is the radius of the circle?
  
• What does the cytoskeleton do?
  
• Question #43c20
  
• Question #242d1
  
• Question #7900e
  
• Question #e8125
  
• An object with a mass of #15 kg# is moving at #9 m/s# over a surface with a kinetic friction coefficient of #4 #. How much power will it take to accelerate the object at #3 m/s^2?
  
• Question #5d727
  
• Question #47f0f
  
• 3. which letter shows the angle of incidence in the figure ? A) A B) b C) c D) d
  
• 5. to see the ball from the openings K.L and M indicate where the plane mirrors should be located in the tubes?
  
• Question #60fb7
  
• What are the conditions for an exothermic vs. an endothermic reaction?
  
• Question #a2cf2
  
• Question #2f1a4
  
• Question #d2991
  
• Question #43383
  
• Question #c4946
  
• Question #8ce1c
  
• Two types of joints connect the skull to the spine. What types of joints are they?
  
• 4. Which of the following is the angle of reflection for the light ray given in the figure? A) 70º B) 60 º C) 35 º D) 30 º
  
• A boy of mass 40 kg is on a waterslide which slopes at 30° to the horizontal. The frictional force up the slope is 120 N. Calculate the boy’s acceleration down the slope? Take the acceleration of free fall g to be 9.81 m s−2
  
• Question #2fa8b
  
• What is the magnitude of the acceleration of the masses?
  
• What is the exact mechanism that causes Parkinson's disease?
  
• Question #75d32
  
• Question #51cf4
  
• Half of the chain is lying on the table. The rest of the chain hangs in equilibrium from both of the ends of the table. The extra length of the hanging chain at one end is #1/8#th of the total length of the chain than that hanging at the other end?
  
• Question #10e47
  
• Two charges of # 9 C # and # -8 C# are positioned on a line at points # -3 # and # -1 #, respectively. What is the net force on a charge of # 7 C# at # 0 #?
  
• If a projectile is shot at an angle of #pi/12# and at a velocity of #14 m/s#, when will it reach its maximum height??
  
• Question #ea4fa
  
• There is a linear relationship between volume, V, and absolute temperature, TK, for an ideal gas at constant pressure....?
  
• Two vectors from an angle of 110°. One of the vectors is 20 units long and makes an angle of 40° with the vector sum of the two. Find the magnitude of the second vector and of the vector sum?
  
• Question #c1ba9
  
• An object with a mass of #120 g# is dropped into #800 mL# of water at #0^@C#. If the object cools by #30 ^@C# and the water warms by #5 ^@C#, what is the specific heat of the material that the object is made of?
  
• A projectile is shot from the ground at an angle of #pi/4 # and a speed of #1/2 m/s#. Factoring in both horizontal and vertical movement, what will the projectile's distance from the starting point be when it reaches its maximum height?
  
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