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An electric vehicle starts from rest and accelerates at a rate of 1.8 m/s2 in a straight line until it reaches a speed of 26 m/s. The vehicle then slows at a constant rate of 1.3 m/s2 until it stops. (a) How much time elapses from start to stop? (b) How far does the vehicle move from start to stop?
An electron and a proton are initially very far apart (effectively an infinite distance apart). which is the change in the electric potential energy
The coefficients of static and kinetic friction between a 67 kg box and a horizontal surface are 0.56 and 0.32, respectively. Illustrate what is the acceleration of the object if a 335 N horizontal force is applied to the box?
A toy car is driven by a battery of 9 V. It draws a current of 2mA. What is the resistance of the toy car
If 5.20 moles of a monatomic ideal gas at a temperature of 300 K are expanded isothermally from a volume of 1.11 L to a volume of 3.53 L
A car takes 11 s to go from v = 0 to v = 75 m/s at approximately constant acceleration. If you wish to find the distance travelled using equation d = 1/2 at2, what value should you use for a.
The two stars in a binary star system have masses 2.2×1030 and 6.5×1030 . They are separated by 2.1×1012 .What is the system's rotation period, in years? What is the speed of the lightest star? What is the speed of the heaviest star?
During an expansion process of a closed system, the pressure of a gas changes from 100 kPa to 400 kPa according to the following relation: P = a + bV Where “a” is a constant, “b” = 100 kPa/m3, and “V” is the volume of the system in meters cube. If th..
a square coil of side 10 cm consists of 20 turns and carries a current of 12 a. the coil is suspended vertically and
A gardener feels it is taking him excessively long to water a garden with a 0.952cm diameter hose. By what factor will his time be shortened, if he uses a 1.58 cm diameter hose.
A spherical source radiates sound uniformly in all directions. At a distance of 13 m, the sound intensity level is 80 dB. What power is radiated by this source
A ray of light is traveling in glass and strikes aglass/liquid interface. What must be the index of refraction of the liquid such that the direction of the light entering the liquid is not changed
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. find the tension in the tightrope
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