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A 60kg sprinter starts from rest and reaches a speed of 8.5m/s in 1.8s. During this time there is negligible air resistance. The sprinter then runs the remainder of the race at a constant 8.5m/s with a resistance force of 52N due to wind.
a) How much power must the runner produce during the acceleration phase?
b) How much power must the runner produce during the constant phase?
18.53 Mars is 1.52 times farther away from the sun than the earthis and has a diameter.532 times that of the Earth. Estimate the tempreature on the surface of Mars
A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 5.47 m/s. The car is a distance d away, What is the maximum possible value for d
A 612 kg elevator starts from rest and moves upward for 4.00 s with constant acceleration until it reaches its cruising speed, 1.84 m/s. What is the average power of the elevator motor during this period
A child on a sled starts from rest at the top of a 15.0 degree slope. If the trip to the bottom takes 15.2s, how long is the slope
A 1.60 cylindrical rod of diameter 0.550 is connected to a power supply that maintains a constant potential difference of 15.0 across its ends, Find the temperature coefficient of resistivity at 20 for the material of the rod
A point charge +q of mass m, (m,+q) is placed at point P along the x-axis where V_r(infinity) is known. Find the expression for the new velocity at the second point
Show that when a region filled with cavity radiation quasistatically and adiabatically expands or contracts the quantities TV^(1/3) and PV^(4/3) remain constant
A series RLC circuit is driven by a voltage of amplitude 5V. If w(omega)= 1000s^-1, L = 5H, C=3muF and R =2komega. Find the amplitude of the current. Find the amplitude of the voltages across the capacitor, inductor, and resistor Find the phase diffe..
Find out the velocity of the rain
An apple crate with a mass of 20 kg stands on a frictionless horizontal surface. A force F = 14.5 N is applied to the crate, find the normal force exerted by the surface on the crate
The mass of the earth is 5.98 X 10^24 kg, the mass of the moon is 7.36 X 10 ^22 kg, How far is the center of mass of the earth-moon system from the center of the earth
An oscilloscope shows a steady sinusoidal signal of 5 Volt peak to peak, if we have voltage knob on 2 volts per division, how many divisions will be read on the screen
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