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Car 1 has 5 times the mass of car 2, but only 0.4 as much kinetic energy. What is the ratio between the speeds of the two cars (v1/v2)?
By how much vertical distance does the ball clear the crossbar?
A string of 14 identical Christmas tree lights are connected in series to a 124 V source. The string dissipates 70 W. What is the equivalent resistance of the light string?
An 8.00-kg point mass and a 15.0-kg point mass are held in place 50.0 cm apart. A particle of mass m is released from a point between the two masses 20.0 cm from the 8.00-kg mass along
The skin temperature of a person is 36 °C and that of her environment is 22 °C. The emissivity of her skin is 0.75 and its surface area is 1.3 m2. How much time would it take for her to emit
a mass attached to a 50 cm string starts from rest and is rotated in a circular path exactly 40 times in one minute before reaching a final angular speed. What is the angular speed of the mass after
Determination of magnetic source depth of monkin area from spectral analysis of magnetic data
Monochromatic electromagnetic radiation with wavelength lambda from a distant source passes through a slit. The diffraction pattern is observed on a screen 2.50 rm m from the slit.
Tarzan swings on a 30.0-m-long vine initially inclined at an angle of 370 with the vertical. What is his speed at the bottom of the swings if he starts from rest?
A 5-g lead bullet traveling in 20^{circ}C air at 300 m/s strikes a flat steel plate and stops. What is the final temperature of the lead bullet? (Assume the bullet retains all heat.) The melting po
A 747 airliner reaches its takeoff speed of 170 in 35.3 . What is the magnitude of its average acceleration?
a motorist driving along a straight road at a constant speed of 60 m/s. At time t=0 she passes a parked motorcycle police officer and begins to accelerate at a constant acceleration a. the officer
A car can decelerate at -4.20 m/s2 without skidding when coming to rest on a level road. What would be the magnitude of its deceleration if the road were inclined at 11° uphill? Assume the same
An archer shoots a 0.10 kg arrow with a speed of 60.0 m/s at a 0.40 kg apple resting on a post 1.7 m high. If the arrow sticks in the apple, how far from the post will the arrow and apple fall?
Two charges are placed on the x axis. One of the charges q1= +8.5 C is at x1 = + 3.0 cm and the other q2= -21C is at x1 = +9. 0 cm. Find the net electric field (magnitude and direction) at
Vector A is 7.0 cm long and points along the negative x axis. Vector b is 8.5 cm long and points at +77 to the positive x axis. Determine the x and y components of both vectors
An ocean liner leaves New York City and travels 16.1 ° north of east for 233 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the shi
A 60.0 kg crate rests on a level floor at a shipping dock. the coefficients of static and kinetic friction are 0.760 and 0.410, respectively. what horizontal pushing force is required to (a) just s
A pulley system has an efficiency of 87.5% how much of the rope must be pulled in if a force of 648N is needed to lift a 150kg desk 2.46m?
A 0.25 kg stone attached to a 0.8 m long string is rotated in a horizontal plane. The string makes an angle of 24° with the horizontal. Determine the speed of the stone.
A car traveling in a straight line has a velocity of 5.67 m/s at some instant. After 7.37 s, its velocity is 8.04 m/s. What is its average acceleration in this time interval?
A recent ordinance was passed to reduce the allowed sound intensity level of the much despised leaf blowers from their current level of 95 dB to 70.0 dB. Under the new law what is the ratio of the
An oil drop carries one excess electron and weighs 9.3 10-15 N. What electric field strength is required to suspend the drop so it is motionless?
A shopper pushes a cart 50 m south down one aisle and then turns 90.0° west and moves 28 m. He then makes another 90.0° turn and moves 11 m. (a) What is the largest possible displacement of
100 grams of boiling water (temperature 100° C, heat capacity 4.2 J/gram/K) are poured into an aluminum pan whose mass is 950 grams and initial temperature 23° C (the heat capacity of alumin